For us, we don't want a trailer with a slide on the curb side. We like having all the room on the curb side for lawn chairs, camp stove and a table. With a curb side slide you are pushed towards the front of the 5er. Most awnings are short unless you get an additional slide out awning. We don't like RV parks and stay in regular campgrounds along with some state parks. Depending on where the fire pit and picnic table are located, a rear curb side slide would stick out into the camp spot too close to the table and fire pit.
If you plan on just doing RV parks then I don't see an issue with opposing slides, but if you want to camp in forest service or even smaller older state parks you may have an issue with the curb side slide.
Probably not that often, but it's just one less thing to go wrong and also one less thing to that will determine whether a CG spot will work.
