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Our 3655 is almost 14K total, with a pin weight of 2400 lb. I had Firestone air bags installed about a year ago. Worked fine so far. I run about 40-50 psi in them. Keeps thing a lot more level when hitched. The bed doesn't even come close to settling enough to engage the overload leaf springs (which were already on the truck when I bought it). Sort of a belt and suspenders situation re the air bags and the overload springs.
I did not get the aux air compressor set up..figured I check the tires anyhow before towing, so check the air bag pressures at the same time. IMHO, not worth the extra $ to be able to do it from inside the truck...and one more thing to break...
In summary, I like 'em..
Best,
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