It has stock springs which are played out as you might expect, and I am not interested in shoveling out the kind of money new springs will cost. I will be towing a 16' bass boat and when I hooked it onto my trailer hitch for the first time it dropped about 2 inches and the rear springs were frowning.
Folks on here seem to favor the airbags over Timbrens, but for the $100 difference in cost it seemed not to make too much difference, and the airbags seemed like they would be a little more work. In short, not worth it for two long tows per year and a few short ones.
I did take time to measure the space into which the Timbrens are going to have to fit, then called Timbren to find out how tall their product is. In case anyone is wondering, from the top of the product to the bottom they say is 5-3/8 inches. The woman from Timbren says if you have a 1/2" of clearance it will work, 1" is ideal. It appears I will have between 5/8th and 7/8ths clearance so I am good to go.
I guess now everyone can tell me how big a mistake I made...