Towing safety stuff would be highest on my list. Since your new trailer is 2 years old, check for any signs of rust or decay on frame and rear bumper. Condition of brakes should be checked and proper operation of breakaway switch. Bearings should have a fresh repack. Tires the most important thing. If the tires are the originals, you should consider replacing them right away. If dealer put new cheap China bombs on it, insist on a quality ST tire.
Jim. 2021b Micro Minnie 2108DS
2021 GMC Canyon Denali 3.6L Gas 4x4, Husky C-Line
170AH LiFePo4, Xantrex XC2000, Champion 2500w df