After reading many posts and talking to people, I put the batterys in the engine compartment on my MCI5C, I changed to 2 group 31 batterys, modified the old A/C compressor support for the tray. I have had this setup for 4 years without a problem!
Isn't side to side weight probably going to be an issue no matter where I put the generator? Of course, the batteries aren't light either.