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
38" John Deere F510
32" Ferris belt driven walk behind
22" John Deere JS60
Poulan Pro straight shaft trimmer
John Deere pro series straight shaft trimmer
John Deere pro series 4stroke blower
Homelite handheld blower
4HP Craftsman walk behind edger
6X12 utility trailer