Hey Jon, it will sit just fine. I just put mine on the front section of my skoolie and havent had any problem with it as of yet. One thing I had to do was to cut the hold down bolts off, they were too long. Seems that the regular RV's might have had a thicker roof line.
95 IH 72 passenger transit school bus w/ DT466 and 545 Allison.
79 IH Scout II/392 (0.030 over) Hamilton Injected/727/D300/Full size axles/36" Swampers/Lockers/OBA/38 gal Custom fuel tank, roll bar, tube doors.