Hey Tony, some time ago I read somewhere about someone did exactly what you are suggesting. He put a winch in the front compartment and cut out the floor. After raising the generator into position he puts some sort of metal bracing under generator to hold it in place. When he wants to use the generator he raises the generator slightly and pulls out the bracing and lowers the generator.
Russ and Linda, So. California
2004 Chevy Silverado 2500 HD, D/A, SRW, SB
2005 2955RL, Pullrite Superglide 16K hitch. Bridgestone Duravis R500 tires. EZ Flex Equilizers with wet bolts.EMS HW50C