thinking out loud...
I don't know about the lift gate or ramp but only 13mpg with the duramax! Time to get you foot out of the floor! I'm interested to see the thoughts on the ramp though!
2007 Chevy Silverado 2500HD Classic Duramax
2014 ferris IS2100Z 61"/32HP
32" Ferris belt driven walk behind
Husqvarna 145BT backpack blower
4HP Craftsman walk behind edger
6X12 utility trailer