I agree with Bird--Pulled triples for 8 years with big Purple, maintenance is the key here. If the equipment is maintained and fifth wheels are greased on that rear trailer, you really never have too many problems. The big difference I see between FEDX and OD is the way our dock guys load trailers. Still amazed how well they are balanced over hear vs there. Cant tell you how many times the rear is heaver by 3-6k than the dolly--that can make an interersting ride but, just slow down a little and that third "wiggle" wagon will generally stop wiggling--besides if it wiggles, it keeps 4 wheelers away from you especially when you wiggle your rear at them LOL --