You need to know that 21' to 25' BigFoots will weigh between 6000 to almost 8000 lbs going down the road. He's a reference, look at the very bottom:
Trailer Weights in the Real World
That said, you are going to need a substantial vehicle for pulling that much weight
and even that will take some effort to get into and drive.
What you are looking for is very, very had to find, especially in your part of the world. Therefore it will still be a good idea to go to a Rally
and look at others for consideration should you not be able to go with your #1 choice.
FWIW: I have been looking for a 17' Bigfoot for several years without luck and I m on the west coast where they are much more plentiful. The few I have seen for sale
out here were either overpriced or had condition issues.