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It has been said repeatedly that rear Thuren coils will kill your payload..... That might be sorta true if you don't know what you are doing?? I don't' want to exaggerate.
I'm going to do a more in-depth video explanation here when we leave Moab. I spent about two hours dialing in my WD hitch. And got the Airstream and truck perfectly level. Achieved over 100% FALR and towed this whole combo nearly 560 miles over the weekend. I also visited the CAT SCALES to get an accurate picture of what's going on with the truck and weights for each axle.
A few surprises there as well. It's a lot to go over and attempt to type up, so I think the video might be easier for folks to absorb.
That being said, we towed this setup weighing in at a GCVWR of 15,860lbs without the use of airbags. And the ride was smooth, stable and completely manageable. So you can run Thuren's rear coils, Kings and perhaps still get away without using Airbags on lighter travel trailers.
I'll share cat scale tickets and things later, right now is Moab play time for the next 3 weeks.