The issue with denting is about pounds per sqaure inch and the issue is the possibility of damaging the ramp by flexing it down in the middle (top to bottom) to the point that it can't spring back to its original shape.
When loading toys, the bottom of the ramp its supported across its width by the ground, but when supported by cables only the edges are supported.
If you put enough weight on the ramp at a sharp point it will dent the ramp. And, if you put too much weight on the ramp you could cause it to bow to a point of not being able to spring back. I would bet that a 950# Wing with a 225# rider only puts a little over half of that on the ramp at any point and that weight is spread over the tire patches (guessing 8 square inches) or, about 160 pounds per square inches on ramp at each of two points.
Consider a woman in heels can put between 1 and 4 tons of pressure (pounds per square inch) on the surface and certainly will do some damage. I would bet a 225# man sitting in a chair could put a ton of pressure on the surface as well.
So, care will have to be exercised; common sense needs to be used.
But, for me I will eventually get the cable mounts made and get it done. I will try to use common sense and if I can't or don't; I will expect to pay serious dollars for a new ramp door.
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