I'm now pulling a travel trailer, and I would like to find the best info on what I should do about beefing the rear suspension for the added weight. I don't know if I should do a add a spring or just heavier shocks. I have a 04 F150 short bed, and the tongue weight on the trailer is approx. 500 to 700 lbs.

 

just an add a leaf or even a helper spring would work for u

 

Or better yet, an air bag setup.

 

Air bags are sweet, but the install's not gonna be fun and they're real expensive. Air bags are probably the nicest thing you can get for your problem, but helper springs come in several weight capacities and that's probably your best bet. Easy install and you'll save lots of money.