Rear end sag solutions needed

I have a 2019 TRD with a camper shell. I installed Sumo springs with 500 lb capacity. My problem is when I hooked up my trailer with my Polaris RZR on it my rear end sags about 1 1/2 inches. Trailer and RZR weight about 1400 lbs. I thought the Sumo springs would solve the problem but didn't. Any suggestions

 

Whats your tongue weight on the trailer? Are you using a Weight distribution hitch?

 

Check your balance. Trailer tongue weight should be 10-15% of trailer weight. Take rig to a public scale to get weight. Most people guess their rig weight way off. You can use a common bathroom scale at home under tongue to get tongue numbers. Then move Polaris on trailer to adjust balance.
I like air bags. Airlift or Firestone. I had them on all my Tacomas. The ones for 3rd gens are a total bolt on. With the trailer you're describing you shouldn't need lift, just check load balance.

 

Thanks for responses. I have tried to reposition RZR on trailer-no difference. I think I might try the air bags. I have a WDH but the shank isn't long enough and If I get a new one I will be close to the ground.

 

I had airbags on my '02, liked them a LOT..
have Sumos on my '16, and while I gave up the adjust ability part, the Sumos are very suitable and take care of my needs.
For you, it sounds like you DO need the upgrade for adjust ability.
Good luck.