I would think that you could just put the generator in there and if it doesn't break the flooring, you would be good to go. How big a generator are you considering. The front storage area in my SuperLite HT 265 RLS has plenty of room for both of my Honda 2000 generators, if I wanted to carry them there.
2012 GMC 2500HD D/A Crewcab
2012 Jayco Eagle SuperLite HT 26.5 RLS
2009 Crestliner Superhawk 1900
2013 Polaris Sportsman 550 EXP
2008 Polaris Sportsman 700 X2