What is the age of the tires? You should get new ones after about 5 years of use, regardless of the tread remaining.
I strongly recommend a good TPMS for your trailer that will alert you to an impending blowout by giving you warnings should your tire pressure or temperature go too high or low. My sig shows what I have.
You need basic tools - wrenches to fit the nuts and bolts in the hitch portion and screwdrivers. I have a roll of duct tape. I also carry a multimeter to help diagnose electrical problems. Have the proper assortment of spare fuses.
Even though I have a 300 Watt solar panel setup on my roof to keep the batteries charged, I also take a 1000 Watt Honda generator and 2 gals of gas for it.
Hi-Lo 1707T - Tire Minder TPMS on Tow Vehicle and Trailer, 300W Solar Battery Charger, Equal-i-zer WDH
2014 F150 Platinum 4x4 3.5L EcoBoost SCrew