Mobile tables earn their castors wherever the work, the cleaning, or the room itself moves:

1. Flexible capacity. Service peaks, seasonal menus, and banquet prep all create hours where one more surface at the right station changes the night. A mobile table is that surface — beside the pass at service, at the salad wall in the morning, gone when the aisle is needed.
2. Cleaning regimes. Hygiene audits increasingly expect cleaning behind and beneath equipment. Fixed tables make that a two-person furniture-moving job; mobile tables make it part of the nightly close.
3. Catering and events. Off-site and function work needs prep surfaces that travel — load the cart in the kitchen, roll it to the function room or the van, work off it on site.
4. Shared and teaching spaces. Commissaries, incubator kitchens, and training rooms reconfigure daily; mobile tables are the furniture expression of that.
5. Progressive workflows. Bakeries and butcheries that move product through stages roll the work to the next station instead of double-handling trays.

The honest counterweights: a castored table is never quite as rigid as a levelled fixed one, it must be braked before serious knife or machine work, and it needs somewhere to live when not in use. Kitchens usually converge on a core of fixed line tables plus one mobile unit per zone — mobility as seasoning, not the whole dish.

Castors are the difference between a mobile table and a wobbly liability; judge them on five points:

1. Rating with margin. Sum the cart's own weight plus its realistic full load, divide by four, then buy castors individually rated well above that figure — kerbs, thresholds, and turning momentarily throw most of the load onto one wheel. Quality carts specify 100–150 kg per castor and up.
2. Wheel diameter and material. 100–125 mm (4–5 in) wheels roll over tile joints, drain gratings, and door thresholds that stall small wheels. Grey non-marking polyamide or polyurethane treads suit kitchen floors — hard enough to push when loaded, soft enough not to chip tiles — and shrug off water and cleaning chemistry. Near cooking lines, confirm heat tolerance.
3. Swivel configuration. Four swivel castors give all-direction agility in tight kitchens; two fixed plus two swivel tracks straighter down long corridors and ramps. Choose by the routes the cart will actually travel.
4. Brakes on at least two, diagonal — total-lock preferred. Total-lock brakes fix both wheel roll and swivel, turning the cart into a rigid table for knife work. Foot-operated levers beat hand levers you must stoop for; staff use brakes exactly as often as brakes are easy.
5. Serviceability. Bolt-on castor plates (rather than welded stems) make the inevitable wheel replacement a ten-minute job. Sealed bearings resist wash-down water; open bearings rust into shuddering within a year of nightly hosing.

A cart that fails in service almost always fails at the castors first — this is the specification to read twice.

Read two numbers, and respect the difference between them: the static rating (the cart standing braked, used as a table) and the transport reality (what can be pushed safely). Static ratings for quality stainless carts run from around 150 kg for light general-purpose units to 400 kg+ for heavy transport tables. Moving safely rarely uses all of it.

The physics of a rolling load: momentum on ramps and slopes, castor drag on thresholds, and steering forces all scale with the load — and a cart's stability while cornering scales with how low that load sits. The working rules professionals converge on: keep transport loads to roughly two-thirds of static rating; load heavy items on the bottom shelf and light ones up top (the reverse of convenient, the right way round for tipping); centre loads rather than cantilevering them off an edge; and contain liquids — a stockpot half of water steers the cart more than the cook does once it slops.

Handling practice does the rest: push from the handle end rather than pulling (carts follow straighter, and feet stay clear of the wheels), take ramps straight-on and slowly, brake before loading and unloading so the cart doesn't walk, and never ride the brakes as a downhill speed control — they are parking brakes. In lifts and vans, brake AND chock or strap; brakes alone do not survive vehicle motion.

If a route regularly needs more than these rules allow — heavier loads, steeper ramps — the answer is a heavier transport cart or a powered mover, not heroics with a prep table.

Yes, and many are — 'mobile' describes the capability, not a duty limit — provided three conditions are met.

Stability equals braked and level. A quality cart with total-lock castors on a decent floor is rigid enough for everyday knife work, portioning, and plating. What it never quite matches is a levelled fixed table's rigidity under the hardest tasks — cleaver work, kneading stiff dough, mounting vibrating equipment — so those live better on fixed or heavily-braked heavy-duty units. If a 'permanent' mobile station wobbles, treat it exactly like a fixed table: check brakes, castor condition, and floor spot rather than tolerating it.

Height must suit standing work. Transport-oriented carts sometimes run lower than the 900 mm prep standard; a permanent station should be at proper working height, which mostly means choosing a mobile work table rather than a transport trolley for the role.

Hygiene routines must follow the equipment class. The advantage of a permanent-but-mobile station is precisely that it can be rolled out for full-perimeter cleaning — so schedule that, or the mobility is wasted. Castor wells and brake mechanisms join the cleaning list, since they trap debris fixed feet never see.

The pattern that works in practice: buy the mobile version of the station whenever the future is uncertain — a new menu, a possible refit, a rented site — and operate it braked in one position 95% of the time. The cost premium is modest, and the first time the line is reconfigured or the floor drain floods, the castors repay it in an afternoon.

Event duty adds travel, vans, and unfamiliar floors to the prep-cart brief — the features that earn their keep:

1. Robust, sealed construction. Van transport shakes furniture harder than any kitchen; welded frames and bolted (not clipped) shelves survive it. Marine-edge tops keep loads and liquids aboard over kerbs and ramps.
2. The right castor set. Larger wheels (125 mm+) for tailgates, car parks, and paving; total-lock brakes for working on unknown, unlevel floors; and castor materials that tolerate the outdoors briefly without staining a ballroom carpet afterwards.
3. Securable loads. Rails, raised shelf edges, and lashing points let boxes and cambros strap down for the drive. A cart that arrives with its mise en place still stacked is the whole point.
4. Dimensions that fit the journey. Measure the van door, the venue lift, and the tightest corridor - then buy the cart. Folding-handle and compact models exist precisely for lift-served venues. Weight matters too: two staff must lift it up the inevitable three steps.
5. Presentable finish. Front-of-house adjacency means polished stainless, no taped repairs, and quiet wheels — a service cart is furniture the guests may see.
6. Fast cleanability on return. Event carts come home dirty and go out again soon; smooth surfaces, removable shelves, and wash-down-tolerant castors turn that around.

Pack the van with the cart braked, chocked, and strapped to anchor points — brakes alone are not vehicle restraints — and heavy items on the lower shelf, exactly as on the road.

Castors are the one part of mobile equipment that touches the floor all day, so they inherit the floor's soil load — and they hide it in wheels, swivels, and brake linkages. The hygiene routine:

Nightly (with floor cleaning): roll the cart off its spot so the floor beneath gets mopped like any other floor area — the parked footprint of an unmoved cart is a classic grease shadow. Wipe wheel treads with the degreaser already in hand; tread films pick up and redistribute soil across clean floors.

Weekly: clean the castor assemblies properly — treads, forks, and brake levers — with hot detergent solution and a brush; string, packaging film, and mop fibres wrap axles and must be cut away before they seize bearings. Check that brakes still bite firmly; greasy brake pads are a silent slip hazard. Wipe frame legs and the underside edges of shelves, where hands and splashes deposit film that inspections find.

Monthly: inspect for corrosion at welds and castor plates (wash-down water sits there), confirm castor bolts are tight, and clear the threads of adjustable components. Sealed-bearing castors need no lubrication; if a wheel squeals, it is telling you soil got past a seal — clean first, replace if it persists, and keep aerosol lubricants away from food zones unless food-safe rated.

Design choices make all of this faster: bolt-on castors with smooth forks, closed-section frames without debris ledges, and shelf undersides without box channels that trap flour dust. A cart specified this way stays audit-ready on ten minutes a week — a bargain against the alternative of explaining a black castor wheel to an inspector.

They overlap on wheels and stainless, but they are built to different briefs, and buying the wrong one shows within a week.

A mobile work table or prep cart is a work surface that happens to move: full 900 mm working height, a top rated and braced for chopping and equipment, total-lock castors so it becomes rigid on station, and usually one deep undershelf. Its geometry says 'stand here and work'.

A service/utility trolley is a carrier: two or three shallower shelves at carrying heights, lighter frame and castors tuned for constant rolling, push handle prominent, top rated for stacked loads rather than knife work. Its geometry says 'load me and walk'. Using one as a prep station means working at the wrong height on a flexing top; using a prep cart as the room-service runner means pushing unnecessary weight all day.

The adjacent kin worth knowing: dish and glass-rack trolleys (framed to carry standard wash racks), plate-stack and banquet trolleys (sprung or slotted for china), ingredient-bin dollies (a platform for one bin), and cash-and-carry flatbeds (goods-in duty). Each is cheaper AND better than a prep cart at its own job.

The selection question that resolves it: will someone stand at this thing and work with a knife or machine? Yes → mobile work table, braked. No, it mostly travels loaded → the appropriate trolley. Kitchens genuinely needing both should buy both — the combined cost is less than one mis-specified unit doing two jobs badly, and the prep cart stops disappearing to the loading dock every delivery morning.