just thought of something else, i take it you all ready have some sort of hull in mind or designed for this vehicle. it might ideal to find a piece of cardboard, draw out the hull (at least maybe the first foot of it), do some cut outs of road wheels and idler/sprocket wheel and tack them to it. then if possible, take a piece of string/twine/rope and run it around the those few wheels, then take it to the bottom of the steps and see how it's going to make contact. this might explain what i was just thinking in that last email as to how your vehicle's tracks will make contact and possible give rather than trying to start climbing and possibly avert any problems in the design later. chris
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