Is there an attic above your shop ceiling? If so, is the current ceiling height 9+ ft high?
I have a couple of 2 post lifts. For both of them I bumped the ceiling up locally (pocket for the vehicle greenhouse to fit into when fully lifted). Not ideal but the only way I was going to get an additional vehicle "parked" in each of the garages. For one of them, a Rotary asymmetrical with the cross beam on top, the ceiling pocket is framed at about 11-3 ft up and the cross beam runs thru the attic, clearing the ceiling joist by about 1 inch. I relocated the bump rod to the underside of the ceiling. I get full lift on all my vehicles without contacting the bump rod/switch - but I don't own a van.
Using a floor jack and a couple of jackstands, I found the fore/aft balance point on the 5 vehicles in our fleet. For every one of them, the CG is within a couple of inches of where the windshield and roof meet (2wd 6 cyl PU, 4wd 4 cyl SUV, 4 cyl midsize FWD sedan, early '60s compact RWD sedan and a nose heavy 6 cyl LBC).