I totally second the comments about TT weight and the TV ability to tow it. Be sure the truck can easily tow it.
Along those same lines, look at carrying capacity. That is the amount of stuff you can put in the trailer. Example: GVWR (I think that is the right one) Maximum trailer weight is 10,000 lbs. Empty weight is 7,000 lbs. Carrying capacity is 3000 lbs. I have seen some trailers where carrying capacity is 800 or 1000 lbs. Not enough in my book.
Look for storage compartments. Is there enough for your stuff? Some trailers will have more than others.
Look for seating arrangements. This may not apply to you, but with kids it might. Where do you sit when looking at the TV? Many trailers are awkward with the TV 90 degrees offset from the viewing angle.
Look for capacity of tanks, especially if you plan to dry camp.
Beware the size of the master bed. Some queens are 60x72, others are 60x80. Don;t go by the descriptive name, check the measurements. Same for bunk beds, I assume.
When we were shopping, we liked the Imagine. Almost bought it, but Arctic Fox won the day for us.
Good luck!!