Relationship between lengths of TV and TT

I spent my working life in a tractor that weighed 17,500 lbs that had an overall gross of 140,000. Our allowable weights in Canada are more liberal than in the States for our trailers. If you can comfortably pull and stop, there should be no restriction on your trailer size. The caveat being that you should have some sort of training to haul anything longer than about 25 feet to remain a safe operator on the road. Too often we see someone with deep pockets buy a big pickup and a 40 foot fifth wheel and hit the highway with no idea what to do.
Off the soapbox now........just my humble opinion.