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There are plenty of 'rules of thumb' out there... And by and far, they err on the side of caution and being overly conservative.
As far as length goes, here's one that gets circulated around the net:
For the first 110" of wheelbase, this allows you 20' of (bumper pull) trailer.
For each additional 4" of wheelbase, this gets you 1' more of trailer.
Assume you have a pickup truck with a 140" wb...
140 (total truck wb) - 110 (your 20' allotment) = 30" left over for the 1' additions.
30 / 4 = 7.5'
So the 140" wb would be "good" for a 27.5' long bumper pull RV.
27.5 seems about right for a max length with a 1/2 ton vehicle.
But pretty conservative for 3/4 ton or greater.
I personally used to have a 32' bumper pull travel trailer I pulled behind a 3/4 ton Dodge. That trailer was balanced VERY well - fresh water tank right near the tongue helped.
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