Finally walked over to the neighborhood ACE and got bolts to replace the ones I sheared off on my trailer hitch. Figured out a way to squeeze all 3 kids in the trailer, then took them to the park and then showed them my training loop. All-told, a nice 15 mile ride.
They got mud-splattered a few times but they really enjoyed it, and it was quite the workout for me on the uphill grades :)
I think tomorrow's project is going to be rigging a rear-facing jumpseat for my youngest in the front of the trailer, since it's already a tight squeeze with all 3 facing forward.
I will call it: the FRANKENTRAILER!