The Koni FSD shocks look like excellent products but seem to be geared more towards increasing ride quality as opposed to drive quality like what we see with the Roadmaster Anti-Sway bars. Because of this I recommend using the Roadmaster system. Your 2021 Tiffin Allegro Red 33AA will have factory bars but these are typically smaller and ineffective.
For your application I recommend the following:
Front Anti-Sway Bar - # RM-1209-139
Rear Anti-Sway Bar - # RM-1209-140
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