All the major makers make a wide version and atleast 90" wide. My haulmark was 93" wide. Also don't forget to not only measure the backdoor but look at the cables on the door. A continental trailer has a 91" door with 86" wide cables. When I bought mine the guys at Phil's trailer sales told me as a rule of thumb if the taillights are on the frame work and not the rear door it is too narrow. So if you are looking for used ones this is a quick way to know if it is atleast 90" wide.
I will share my two cents for what its worth. I bought a very nice 28' Haulmark Edge trailer. It was all I every wanted until I got it. It was so nice that I spent more time trying to keep it clean than enjoying it. I sold it and hadn't regretted it yet. These buggys and hobby put a beating on nice stuff. If I was to do it again I would get one that is 30' minimum, insulated but has plywood walls, diamond plate floor, and a very good HEAT PUMP/AC combo unit that is wired for 50 amp service. I loved all of the lights but just hated how much wear and tear just a couple trips took on the inside of it.