Ouch.... Unless you are making an initial pick-up, a 500 mile first trip with a 30+ y.o. camper might not provide the best first taste of an FGRV.
If it is for initial pick-up, be sure to not only inspect the tires
for condition and AGE, but also give serious thought to having the wheels pulled off and the bearings repacked before starting out. If it has been parked for a long time, and they haven't been repacked in ages, you could be looking at axle
and hub damage on that long a tow.
Also, when I make a pick-up I always take along a set of magnetic stick-on towing lights
. They are currently on sale for about $10 at Harbor Freight.
At least 75% of the time there is something going wrong with the rigs lights