Im building roughly the same thing on a Volvo chassy and the general numbers i have measured on most motorhomes is no more than 10 feet. Personally i think 10 feet is to much in my opinion (on a 36' total length build) so on ours i have approx 6 feet of overhang.
There may also be state or provincial rules that you may have to contend with as well, some will indicate max overhang of a recreational vehicle so take a few minutes to verify the DOT/MOT website.
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