Jack for trailer to change tires?

I would also make sure that you have a proper size tool to remove lug nuts on trailer. Having worked on vehicles for over 50 years, I have found that most lug nuts are way over tightened by tire installers. I would try and loosen the lug nuts at home and then re-torque to correct value. this will save you some trouble if you ever have a flat on the road. I have had to use a 4 foot long pipe on a breaker bar to loosen them.