There is one brand of bags that don't require the 5 psi minimum as it has an internal rubber jounce . I think it may be Airlift???? Maybe worth checking.
When I towed with my 150 I added a superspring overload on top. Really worked as described and only engaged when the weight called for it so it did not effect unladen driving . Would recommend highly. Set it and forget it. Adding the leaf does effect everyday driving. The airbags does provide for adjustabilty.
The Rams with the coils are really soft with payload low. Good luck.
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