Your dealer nailed it. That is why I went with the Timbrens. Since then, TLC has come up with an air ride system similar to that on semi's. It does NOT go inside the coil, but rather in the same place as the Timbrens. I will NOT be selling my Timbrens right away though.
I actually talked to Tiger Automotive today in Saskatoon and to my dealer and they both recommended Timbrens. I was actually told by my dealer that the airbags which install inside the coil spring are very prone to getting pinched by stones that get caught in between the coils and the airbag causing leaks in the bags. So I picked up a set of Timbrens from Tiger Automotive. Thanks for your help.
The Timbrens will definitely work for you if you have stock front suspension. I run as high as 800Lbs on my tongue, and with the trailer attached, I'm almost perfectly level.
I am upgrading to the TLC system for adjustability, as I want to level my truck and maintain the level with the trailer attached. If you don't plan to level, the Timbren SES units are absolutely great!
I see you are running Timbrens on your truck. My truck will be arriving in a week or two and I tow a 26 ft trailer and sometimes haul a 750lb Quad at the same time in the truck bed. My previous truck was a 04 Chevy crewcab and I had firestone airbags on it for when I hauled my quad. Do you think the Timbrens will keep my rig level with the quad in the box and the trailer behind? I use a wdh hitch on the trailer.My trailers hitch weight is about 450lbs.Any advice you can give me would be much appreciated.