I've towed an enclosed weighing roughly 7500lbs, I do use a set of Sumo springs from Super Spring when towing. It's similar to the Timbren I would say but its more progressive, both options bolt onto the frame to replace the factory bump stop. I also use a Weight Distributing Hitch (WDH) with Sway Control bar when towing this trailer. I haven't measured ride height front or rear when hooked up to the trailer (which I'm sure will **** a lot of people off) Truck pulled it just fine. I wouldn't go any bigger without upgrading the brakes, a lot of people seem to think if you can pull it you are "ok", but it's the stopping people don't consider until it's too late.
WDH aren't just for making it ride level, it's also to keep some of the weight on the front so you don't experience lose in steering ability due to reduced weight in front. See the attached for an example Top is WDH, bottom is with air bags or a simple bump stop bolt on such as Timbren or the Super Spring I chose to use when towing. The below diagram they used a scale under each wheel and to measure the weight change at each corner of the truck and each wheel of the trailer, the WDH helps balance out the trailer weight as well (assuming you have it decently balanced before you hook it up)
Yes I do plan to replace the rear springs and eventually get a bump stop kit.
Yes I knew the Raptor wasn't designed for towing when I bought it.
There is an entire story involved in how I ended up with a Raptor, I don't think I would have got one if I couldn't tow a trailer the size I have.
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