The best replacement for tiffin is newmar.

The best alternatives to tiffin are rated as following:
★★★★★  newmar
★★★★  winnebago
★★★  monaco
★★★  fleetwood
★★  entegra
★  nonsuch
★  american coach
★  forest river
★  holiday rambler
★  michigan tech
★  ekta
★  avon
  mckendree
  sutton grammar
  grand valley
  grand valley state
  country coach
  tiffin

Your alternative for tiffin is not listed? Suggest!
Speaking about tiffin, one probably shouldn't forget about maltesers.

Other search terms related to tiffin and their ratings are:
★★★★★ maltesers
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tiffin
newmar
winnebago