2016 TRD Sport w/tow package ...rear suspension ?

I've been towing a 6' x 10' utility trailer with my truck and if properly loaded(max 3500lbs for trailer and under 600lbs in the truck) have had no issues considering I live in western Montana, in the Rocky Mountains.
Now the wife and I are looking at travel trailers, mostly the Jayco Hummingbird w/Baja package fully loaded it's 3500lbs. With that, I suspect we'll be hauling slightly more than 600lbs in the truck for a camping trip.
What type of upgrades are out there for my trucks rear suspension?
Would air bags help?
Heavy duty shocks, considering the off road variable?
Any advice to upgrade my Tacoma for off road travel trailer towing?
Thanks for the help

 

I tow similar to you. Added Summo Springs (airless airbags, sort off) and my rear is level at full tow plus the extras.

 

are these the springs?
https://www.etrailer.com/Vehicle-Suspension/Toyota/Tacoma/2016/SSR-610-40.html?vehicleid=201619635

 

^ yes

 

U guys see any lift in the rear with these ? I've heard of minimal (1 " or less) with em.

 

Yes, small height increase. This is how my Taco sits presently. FYI: I also have 18" wheels so that might add to the height. 37 9/16 from the floor/ground to the bottom of the wheel well.

 

Great thanks. Did you notice any difference in rear ride quality? Doubt it but just double checking

 

No discernible change to me.