Have pulled a camper from "Austin to Boston" several times. What type of roads will you be traveling on?
Will second getting the bearings replaced. Also, take a good look at your tires & spare [if you have one]. Not much more fun to be had than changing a trailer tire on the side of the highway.
Gas mileage will suffer. The front end of that trailer will act like a drogue parachute, holding you back. Not to mention the effect of crosswinds. Don't want the tail wagging the dog.
Do some PM on your tow vehicle, especially your braking system & transmission. Maybe new fluids for both systems.
Have you ever towed that trailer? Regardless of the combination, adding a trailer to a vehicle changes all sorts of vehicle handling characteristics. Starting, stopping, & turning are all greatly affected. Get some local practice in before starting your trip.
If you know that all your parking places on the trip will be pull-throughs, you should have no problems. However, it doesn't hurt knowing how to back up with the trailer attached. Find a large parking lot - mall, football stadium, etc & practice. Obviously the size of it limits your rear vision, so take your co-pilot with you to standardize your communications when backing up.
Finally, is the trailer structurally sound? Waterproof?
I'm sure others will have more to say.
Have a safe trip. Let us know the results.