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An I have the porterbuilt trailing arm kit. Also a complete lack of instructions, just a few pictures and one measurement for the C-notch. They are helpful with questions and problems when you can get in touch with them. It rides good but it was alot of trouble to install for a "bolt-in" kit. I had to modify alot to get it to fit. I'm happy with it but given the opportunity I would go another direction on a different truck.

Sounds like Ride Tech is your best bet. Honestly anything that gets you away from leaf springs in the rear should ride better.