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Carrying capacity.The possible load on the ramps varies depending on what is driven on them. Cars and vans have large wheelbases (front to rear), which means that the load on the ramps is more spread out and therefore smaller. Caterpillar vehicles, despite having shorter or longer tracks, load the rails more single-pointedly and therefore more strongly. Similarly, mini-tractors and production machines. These differences result in different load capacities being specified for different vehicle types. Depending on the circumstances, the use of the ramps at the limit of their durability may result in their slight deformation. It is advisable to have a load reserve when selecting the slides. For some gangways it is possible to order a special support, i.e. a higher load capacity.

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Backing.
In the case of channel bar ramps, which are used for car carrier trailers, the method of backing is simple. The channel bar tooth overlaps the support profile on the trailer and thus the ramp is properly supported and secured against displacement. Whereas in the case of a ramp with a paddle leaning on a box or a van, the way of leaning is more complex. Incorrect support of a ramp with a paddle can cause the paddle to break off, which may result in a fall of the vehicle. It is also important to anchor the paddle of the ramp with a bolt that goes into the body box to prevent displacement of the ramp during entry and exit of the vehicle. The car ramp should be positioned against the vehicle, preferably across the entire width of the paddle or in two places: at the end of the paddle and at the junction with the structure. It is best to order a paddle-ended car ramp with the welded-in paddle at the right angle so that the paddle lies flat on the backrest of the box or van. When ordering it is sufficient to specify the height from the ground of the paddle resting on the vehicle. The graphic below shows on the left the wrong way of supporting and on the right the correct ones.

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