Also, and though some Tire Stores that do not understand that the same laws of Physics apply
and push back at the request to "Have them make Money" by doing such....
Do take the time to have all (including the spare) the tires balanced. And (little tip) IF it takes more than 1 to 2 oz of weight to bring them into balance, have them break down the tire and spin it on the rim (90 or 180 degrees) where you are not catching both the High / Fat Side of the Rim and the Tire at same time... No need to have a Boat Anchor's worth of weight slapped or taped on the rim to bring one into balance.
That same aspect by the way, also applies to your Truck / SUV, etc.... Slapping a huge amount of weight on one to correct the balance issue should not be needed short of a bent rim or large chord shift problem inside the Tire
Be that as it may, having them done will make it smoother to trailer at highway speeds, help improve tire wear, while also helping reduce on trailer axle bearing loads.
Oh, and don't forget to carry a extra hub and bearing set just in case of failure. Though can be a little heavy to lug around I agree.. I have a larger boat bag that held a small jack, lug wrench, grease / oil (pending on hub type) for long trips, just in case...
Hope this helps!
Dave