Advice on buying a new travel trailer on a budget?

My trailer was $13k new and it's towable by anything with a 5k lb+ tow rating (technically 3,600 but that did't work so well), it's big enough for 4 large people, but unfortunately it's 20.5' bumper to bumper which is over what the OP says they need (which if it's a hard number means only 14' boxes would work but those will be very tight for 4)