First of all practice the stairs with the PT before leaving the hospital. If you are allowed to put your full weight on your hip this is possible. I would recommend you use the rail on the left side and a cane on the right side for support. Go up with your un operated leg first and then raise your operated leg to the same step as your un operated leg. Repeat until inside. Once inside the trailer use your walker.
The first step into the trailer is always a big one. You may want to buy or acquire a step stool shorter than the height of the trailer's first step to make an easier transition. There are some step stools with handles which are beneficial also. Again go over the scenario with your PT before leaving the hospital. Take a picture of the step situation for the PT as many are not too familiar with TT set up. Doesn't hurt to start practicing now.
I am more concerned over the bathroom situation. TT commodes are low to the ground. Are you getting an anterior or posterior approach, as you may have hip precautions? You may need a raised toilet seat or a 3 in 1 commode to go over the toilet so you don't sit so low you may dislocate. The 3 in 1 commode may be too wide for typical TT bathrooms. Take measurements of the width of the space from the area surrounding the commode to see if the equipment will fit. Give to your OT and PT. Unless you have a generous bathroom your walker will not fit through the door. Turn the walker sideways and stay inside the walker and side step your way into the bathroom.
Trust your rehab staff's opinion for the safest discharge location as you may need rehab, but they will let you know.