Sorry about the test. I believe I was experienceing operator error earlier when a reply disappeared.
Anyway, thanks for all the good info. I didn't even know Burley made a trailer bike. I'd love to get one but the budget probably won't go that far. I looked around for a used one to no avail. I'm going to go out and look at some diferent models locally and see where the best compromise might lie. One more thing before I go: I planned on doing a wacky bike--trailer bike--trailer convoy from time to time with my two sons (oldest, 4 yrs old, on the trailer bike and the 2 yr-old in the trailer), but my wife thinks that's crazy. Has anyone else done this three-part rig and was it successful?
--Chris