We recently bought the 320A. The dealer has been good working with us but no major issues right now. When we had our 21RR and warranty issues the dealer and FR always helped us out.
If you do buy one from FR make sure to buy the extended warranty for $150. We almost missed out because the dealer didn't mention it but I read about on this forum.
2016 Vengeance 320A
2015 Chevy 2500HD LT 6.6L 4x4 ccsb Z71 trim
2012 HD Electra Glide
Andersen Ultimate Aluminum fifth wheel hitch V2
Nights camped 2015-didn't count
Nights camped 2016-43...so far