I have been running the larger truck style Dnyabeads on my camper for the last 5 years. I have also moved them from the original Denman's tires I started using them with to an upgraded LT commercial truck tire. The reason I went bigger beads was from cost (cheaper in bulk) and the added protection they do not fly out the air stem hole.
I have my own tire machine, yes a real old one but it works still, and scooping up the beads is not really hard to do during a tire change. I just took a small round left over plastic container from a drink mix I think and scooped them up. All of about 2 minutes to do. Key is, realize they are in there and take care when un-mounting the tire from the rim and you can keep all of them to use again.
I posted with pic's in this post. There is also a video in there showing how they work
Balancing TT tiresI am a believer in them, they work well for me and help balance the entire hub assembly which in the RV industry normally does not happen. They do not machine the brake drum lining area to spin true to the bearings. The tolerance is 0.015 TIR, some you might luck out on within 0.005" others are 0.025" TIR. It cost a little more to take care and turn the drum to run true. I have tried to have tire shops dynamically balance trailer wheels. None of them had a an adapter hub to pilot the stud holes and could only do it off the stamped center core. I get the answer, we normally do not balance trailer wheels.... No one asks for this. So I gave up trying wheel weights and went Dynabeeds that I can add myself.
Hope this helps
John
PS I really do not know about using BB's. I myself would not go there when the Dynabeed option is available.