My skoolie isn't a 40 footer, from the rear axle it is 14 feet to the back bumper, so only 2 feet more shouldn't be to much of a problem.
I am getting a 10 foot ramp that I will be storing under the middle of the back end. I did some math and double checked on a website i found and it should not be a problem, getting a u-haul ramp from an old wreak
How To Determine Proper Motorcycle Loading Ramp Length| discountramps.com
It's coming together slowly but doing it right or at least I hope so!