I am building a ramp to load a 23" OTB into a van. The ramp is going to have grooves in it that the wheels will fit in to help guide the cooker up the ramp (i.e., so it won't roll off the side of the ramp). Unfortunately, I don't know the dimensions of the wheels so I am not sure how wide or how deep the grooves can/have to be. Would someone with a grill mind measuring the wheel at its widest point (below the feet "shroud" edge). As well, exactly how far is it from the ground to the bottom of the "shroud". I would hate to make the grooves too deep and have the cooker not be able to roll up the ramp at all. Thanks in advance.