What are looking for? Bumper pull, 5th wheel? Got kids? What is your pulling rig? Looking new or used?
There are so many out there. I have owned Keystone toy haulers and have no complaints with them. Jayco has been around a long time too. Grand Designs is a newer company but I like theirs too.
If looking for used I would make sure the company is still making trailers. Seem to be a lot that come and go.