Got back from my Labor Day trip to NC.
This was my first trip with the Airlift 1000 air bags in my Suburban. The trailer is a Surveyor Sport 189 - 20ft long, ~ 4200lbs loaded with a tongue weight of ~450lbs. I don't use WD on this little trailer. Manual says up to 600lbs OK without WD. Up to 1100lbs with.
In another thread, I described installing these bags. The are the kind that fit inside the rear coil spring (no leaf spings on this truck). I drove the truck around town inflated and they rode fine. When I hooked up the trailer, the rear sank only about an inch. Great.
Well, this past weekend, I took the trailer up to North Carolina. First, the truck felt like I was riding on marsh mellows. A very unsettling feeling. By the time I arrived in NC - about an hour - the air had leaked out completely - so the rear of the truck sagged more and thus the trailer was more tongue heavy and unlevel. I think the leaks are at the top of the bags - there is a barbed nipple the hose fits over, but the instructions don't show that you clamp over this. It's nearly impossible to reach with needle nose pliers to secure the hose. All the other connections have clamps. Can't hear or feel any leaking.
Even if I could get them to hold air, I don't like them. I now think the design of putting the bag inside the coil spring is flawed. The ride quality is very strange with a load on the back.
So I've ordered some Timbrens and will see if I like that better. Basically with the 2012 Suburban, the Airlift 1000 and the Timbrens are really your only choices. The Airlift 5000, Firestone and Hellwig show no choice for this truck. Look at the video of how the Timbrens work on thier home page. Was thinking they were just a big bump stop, but that is not correct. More like a helper spring.
Not really asking a question, more like a venting. If I can't get some reasonable towing performace out of this Suburban, it's gonna go.