One tire wearing on outside edge only???

[djsamuel]

That would be better answered from the group here as I personally do not know if too many people actually do balance them.  When we purchase them they are already mounted on rims and I have never seen any balance weights on any of them.

I would definitely balance the tires.  The spin at the same rate as car tires and can cause significant vibration into the camper when towing at highway speeds.  You may not feel it in the tow vehicle, but things in the camper could be shaking pretty strong.