I'm in the camp of balancing them when used on the camper. I my case I did not have a tire dealer who has a hub for his spin balancer to balance off the lug holes. So I went with DnyaBeads. And in this case the poorly out of round brake drum gets balanced along with the tire and rim.
See here on HenryJ's post, I added too and how I did mine.
If you are wanting longevity, balancing does help. The camper will not self destruct with out them, but it will run smoother, help the bearings, tires and take vibration as much as it can out of the trailer frame.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club