I'd want at least a foot in front of the car so it's not ramming up against the back of the sleeper. Then the other measurement you need to make sure of is from the hitch pin to the back of the car. 5th wheel trailers need a certain amount of room there so they don't hit anything when you're turning tight turns. I'm sure you can find that dimension out. As far as how far back you can put the hitch. I don't think there's much concern there. I've seen lots of HDT's with the frame extended back and the 5th wheel hitch hanging way off the back. The owners tell me it actually makes it easier to back up and maneuver when it's moved way back there.
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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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