Well now that you've explained that you have too much negative equity to trade up to a 2500/3500 SRW, you might mention how much you tow and where. However the rear squat problem has everything to do with your trailer's tongue weight vs your trucks payload. The average tongue weight is appx 12-13%, so your empty trailer could be taking a substantial part to all of your available payload.
Since I assume you don't go with an empty bed and by yourself, you are likely maxed out or worse as everything in the bed, the hitch and the extra people in the cab all count against payload. Your probable P rated tires aren't happy with that amount either.
To raise up the squat requires a) the proper truck, b) air lift/bags of some sort, c) a weight distributing hitch. Then there's d) adjusting your trailer loads so that there's not anything extra up front, like full propane tanks/batteries on the tongue or heavier items in the front room area.
If you live in Florida and pull on flat roads at 65 or slower, with max inflated tires and a good wdh and air bags, you could be ok for "limited" usage. I see peeps pulling too heavy all the time, and the news reports aren't full of horror stories about wrecks. It's just not a good practice at all.
To get more specific towing information, try the various rv forums. That's where you'll get a "proper" flaming but also read on how others in your situation have modded their trucks to be level.
I don't condone what you are doing as far as the safety of yourself and others aspect but I'm a realist - peeps buy the truck first instead of the other way around.