Welcome.
Please do be cautious and keep your load down as low as possible in the trailer and Toyota. That is a very heavy trailer for your tow vehicle. I tow with the same vehicle, I assume you have AWD and a 5000 lb tow rating, as I do. I'm not talking about horsepower, that's fine. You can easily go over your weight limitations especially if you plan to boondock. I suggest that you weigh your rig loaded for camping and see what you really have. if you do a search here you will find weighing procedures you can use. You need to check gross combined vehicle weight and tongue weight as well as trailer weight. Also, consider getting weight distribution hitch if you haven't already.
Its not unusual to have imbalanced or misadjusted trailer brakes. They are 1940's drum brake technology. You can check you trailer brake adjustment by making a few stops from 30-40 mph down to 10-15 mph on a flat empty roadway using only the manual control on your brake controller. Then, pull over and check how hot the trailer brake drums are. They should both be about equally hot but not smoking hot. If the rig doesn't slow down, if either drum is still cold or one is really hot you have a problem.