Must have had 2 rx1s with added lead in them!
This makes no sense at all. 3/4 ton diesel with extra engine weight up front and at most 2klbs all in, deck and sleds on the back. A 2500 dmax shouldn't even squat.
I know they're similar spring/payload cap as any 3/4 ton and my 07 2500 Dodge short box, with aluminum deck, 2 sleds on the deck and a 2 place loaded enclosed on a 18" hitch extension barely leveled the truck. I have airbags for a camper and only run a signatory 5-10psi in them with this setup in case of bottoming out on rough roads.
Heck I only need 55-60 psi to level the truck up with a 4500lb slide in camper. You put a 4" lift in back with 80 psi and that small load.
Your post is misleading or something wrong with your truck....or you're loaded heavy with a lot of other "stuff". No way a deck and 2 machines makes a HD pickup unsafe to drive.
My truck sits level unloaded (my choice), the rear suspension is factory stock other than a set of Bilsteins and the bags. Front has a Norcal Trucks/Cognito "stage 4" leveling kit.
There's nothing wrong with my truck, it's been running in it's current configuration for 7 years.
Have you ever weighed your truck when it's fully loaded for a trip? I have. It adds up quick.