On my 45' XL the front dimension, floor to underside of body support point is 15" and the rear dimension from the floor to the underside of the body support point is 13 15/16".

These are with full bus air system pressure on the airbags and I think the heights are mechanically limited by the suspension linkage. I am sure there are variations from coach to coach and because of tire sizes and pressures.

Based on dimensions required for XLII coaches I think we can come up with a way to make the supports universal. I know we have some good thinkers out there so I'll throw out the first idea.

I think we can make the set two pairs, one pair 14.5 " and one pair 13.5". I will then see if we can include with each set eight shims cut to match the top of the stands and with 4 being around .100" thick, and 4 being around .150" thick. In this way you could fill the spaces if you desire with shims to compensate for uneven floors or variations in the shell. At the worst you might be supporting the coach 1/2" less than at maximum height.

If the XLII dimensions vary widely from the above we may require shell specific support heights but I don't think that will be an issue.

Any ideas or suggestions?