6,500# is the max towing weight for a GX. IMO, anything over 5,000# is not going to be "fun" or easy to drive....but is within the limits of the vehicle. That 25' camper is probably bumping up over the 5,000# mark, but should have a sticker on it somewhere to verify. Don't' forget to account for gear you haul in the camper.
Assuming you're in that weight bracket, you'd need to have the OEM 6,500# hitch and trailer wiring, a trailer brake controller, weight distribution hitch with sway control, tack-on extended mirrors to see past the trailer, and a OBD2 dongle and app to read transmission temperatures. The weight distribution hitch requires trial and error to set up and dial. Yes, your GX might have airbags, but these still tow better with a good WDH.
Depending on where you are going in AR and how you get there, you may run into a lot of hills. The A760F does not lock up in 3rd gear or below (and you will need 3rd gear to get that up steep hills), so you can very quickly get the transmission hot. On the flats, I'd planning on running in 4th gear at 60-65 mph and staying out of 5-6 gears unless you're going downhill. You'll get buzzed all day by fast traffic on the interstate.
GX's can be good tow rigs - mine is for a low-profile 4,000# loaded camper - but it requires some trial and error to get them really dialed right.