I have E-Venture on my 2022 F-350 Tremor - 3.5" lift - torsion bars, upper/lower steering stabilizers, soft rear springs, shackles, and air bags with Daystar cradles. I have over 57,000 miles of towing (30k), street (20k) and offroad (7k). It is not a Raptor, but it is a great all around truck and suspension system - the ride quality is second to none - I sent my shocks in for rebuild at 55,000 miles and had the pathfinder shocks on while the rebuild was underway - it is very nice, but I was very happy to have my E-Venture shocks back. The E-Venture shocks really smooth out the small bumps/chatter and the ride is much better. E-Venture also give you total flexiblity, tune to your liking, and adjust rear for towing to full firm all from the cab. Other than the price there is nothing not to like about the E-Venture.
When you go to tow 36', even if just 9k - the tail will be wagging the dog if you are in any 1/2 ton, worse in a Raptor - you are just be a passenger in the Raptor if things go wrong - in the Superduty the truck will remain in charge. From a safety standpoint the SD is far superior and if towing a travel trailer you most likey have precious family cargo! I am towing either a 17k toy gooseneck toybox or a 10k race car traier. The 10k race trailer (24') will tax the Raptor versus not even noticing it is there in the SD. When it comes to towing the HD trucks are superior. The rest of the days you will wish you were in the Raptor R!
Personally I would not put a $8k or $12k supsension on 2021 with 55k miles on it - I would get a new truck and do it to that so you can amortize the cost over 100k miles! Other alternative is to get the Raptor R (which is my favorite truck) and downsize the trailer a bit and you will be good to go. GLWD!
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