I don't think I'd like that gear ratio. My truck is single rear axle, 26' living quarters. 10 speed Eaton autoshift. I don't know if the 10 gear is higher than the 9 on your trans. I know at 70 mph. I'm turning about 1425 rpm's. I'm 29k lbs. with full water and fuel. I'd even like a lower numerical rear axle so I could drop the rpm's at 70 to like 1200-1300? It's not worth it for me to have the gears changed out to do that. But, if the rear axle were to need work I would certainly look into that. I bet with 4.10's your going to be screaming along at 70 mph.
I wouldn't go any shorter than 26' living quarters. My wife and I have gone on a few 3 week trips. Nothing longer. Ours is just great at this size, one slide out in the living room. I think smaller would not be as comfortable. Plus you lose storage space underneath. My storage bins are all pretty full.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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