Any good pair of shocks will be fine.
I'd recommend the Rancho RS5000X as they ride the best of any off-the-shelf shock for TJs, and they are also very cheap. You'll find they are probably the most popular choice for TJ shocks.
However, they also make an adjustable version, the Rancho RS9000XL. These ones have knobs on them where you can dial in how firm or soft they are. While not 100% necessary, they may be nice to have with the trailer, so you could always make them firmer in the rear when you were towing.