Large-H vs Small-H car wash lifts: wheel support or lifting pads?

The short answer: choose the support method first

“Large H” and “Small H” are practical nicknames used for two support layouts in this product range. They are not universal technical classifications. In this guide, Large H means a wheel-support platform: the vehicle rests on its tires. Small H means lifting-pad support: pads contact approved lifting points on the vehicle body and the wheels hang free.

Choose between them by asking what must remain accessible during washing, how the vehicle can be supported safely, and whether its dimensions match the lift. Rated capacity matters, but a higher capacity alone does not prove that a vehicle will fit the platform, its lifting points will align with the pads, or the site is suitable for installation.

Wheel-support platform: the vehicle stays on its tires

With a wheel-support platform, the operator drives the vehicle onto the supporting surfaces and positions the tires within the intended area. This can make the support method easy to understand during vehicle positioning because the tires remain on the platform. The buyer still needs to check wheelbase, track width, tire position, vehicle mass and the manufacturer’s permitted load distribution.

The trade-off is access. A platform under the tires can cover areas close to the contact patches and can limit direct access around parts of the wheels or platform-covered underside. Before buying, list the actual cleaning jobs: general underbody washing, chassis inspection, wheel-arch cleaning, wheel cleaning or detailing. A wheel-support layout may suit one sequence and obstruct another.

Lifting-pad support: confirm the approved lifting points

With lifting-pad support, the pads contact approved lifting points and the wheels are free of the support surface. That makes the tires, wheel arches and some nearby underbody areas easier to reach. It can be useful when the cleaning process needs the wheels to hang free, but only when the pad positions and vehicle balance are correct for the exact vehicle.

Ask for the support layout drawing and check it against the vehicles expected in the wash bay. The operator must be able to identify the approved lifting points, place every pad correctly and keep the vehicle’s center of gravity within the permitted area. For low-clearance vehicles, check the required entry clearance and positioning method instead of assuming every passenger car can drive over the pads.

Do not turn a 4T versus 5T label into a fit decision

Capacity and support format answer different questions. Capacity states the maximum rated load under the manufacturer’s specified conditions. The support format determines where the vehicle is carried and which areas remain accessible. A 5,000 kg rating does not automatically mean that a wheel-support platform fits every SUV, van or electric vehicle. A 4,000 kg rating does not confirm that every passenger car has compatible lifting points.

Verify the maximum operating weight of each vehicle, including carried equipment or loads that may remain inside. Then check wheelbase, track width, tire size, ground clearance, approved lifting-point locations and weight distribution. Keep any unknown item open until the supplier reviews the vehicle information and the lift drawing.

Match the lift to the washing task

If the priority is broad underbody access while the vehicle stays supported by its tires, start by assessing a wheel-support platform. Mark the platform-covered zones on a plan and make sure the spray sequence can still reach the required areas. Also check how hoses, drainage and staff movement will work around the raised platform.

If the priority includes cleaning the wheels, tires or wheel arches while they are unloaded, start by assessing lifting-pad support. Confirm that the workshop has a repeatable process for locating the correct lift points on each vehicle. Do not trade safe support and positioning for a small gain in cleaning access.

For mixed vehicle fleets, collect data from the largest, heaviest, lowest and shortest vehicles, plus any model with unusual lifting points. Testing only a typical sedan leaves the limits of the intended fleet unanswered.

How the two current BAOHUA configurations differ

The verified 4T in-ground single-post car wash lift is rated at 4,000 kg and uses lifting-pad support. Its listed minimum height is 110 mm, so low-clearance vehicle access and pad positioning must be checked. The product is described as an in-ground, single-cylinder air-hydraulic/hydraulic lift. The exact support points and vehicle compatibility still require the applicable layout and operating instructions.

The verified 5T in-ground single-post car wash lift is rated at 5,000 kg and uses a wheel-support platform. The listed platform size is 4,000 × 2,100 mm and the listed minimum height is 0 mm for the specified installation configuration. Those figures do not remove the need to verify wheelbase, track width, load distribution, excavation, drainage and the installation drawing.

These are separate products with different support arrangements. Treat them as two starting points for a vehicle-and-bay review, rather than assuming that one platform can be substituted for the other.

Send a vehicle-fit worksheet before requesting a quotation

A useful inquiry should include the vehicle types and model years, maximum operating weight, wheelbase range, track-width range, tire sizes, ground clearance and approved lifting-point information. Add the exact wash tasks and identify whether the wheels must remain free. Photographs can help explain the bay and vehicles, but they do not replace measured dimensions or a lift layout.

For the site, provide a dimensioned bay plan, floor and pit information, drainage locations, known underground services, available compressed-air information and local installation requirements. Ask the supplier to identify which drawing revision and operating instructions apply to the proposed configuration. Installation feasibility is a separate check from choosing the support format.

Use the same worksheet for every quotation. A proposal should state the exact support arrangement, rated capacity, applicable vehicle limits, required site work, control and utility requirements, installation documents and maintenance access. This keeps the comparison focused on the actual fleet and bay.

A practical selection rule

Choose a wheel-support platform when the vehicle dimensions and load distribution fit the documented platform limits, the tires may remain supported, and the covered areas do not conflict with the washing process. Choose lifting-pad support when the approved lift points can be reached and positioned correctly, the vehicle remains balanced, and free-wheel access is useful for the work.

If you cannot confirm the vehicle limits, support points or installation plan, do not decide from “Large H,” “Small H,” 4T or 5T alone. Ask for the matching layout and have the supplier and competent site specialists review the vehicle list and wash-bay plan before installation.