Car hauler trailers

I hauled a 6000lb dually, with the outside tires removed, from Cali to Arizona on my $800 open 14 footer, no problem at all. Bought the trailer at least 30 years ago, have no idea what the axles are rated.....
My Imperial has a wheelbase a foot longer than a b-body, two feet longer than an a-body, also fit fine on my 14 footer.
And I can store my trailer where I want.... which I can't, in my situation, with an 18-20 footer.