Honestly, $1,100 doesn't sound like a bad price.
I had PPF, with a lifetime warranty, installed in Missoula 3 years ago and is was a few dollars under $1K.
No paint work but I had PPFinstalled in a few additional locations (door handle wells, A-plillars, headlights).
I have read that the DSSV's put in the Canyon's & Colorado's have had some issues but I haven't read of any issues in the 1/2 ton trucks. If I remember correctly, the 1/2 ton version has a larger diameter rod and maybe other changes I'm not familiar with.
Mine haven't leaked a drop (knock on wood) and truly transformed the truck's road manners.
I went from the stock Ranchos (junk imo) to some new take-off DSSV's. Night and day difference.
Not sure if you have a 2" factory lift? My AT-4 does and the Multi-Matics bolted right up.
This is definitely a great upgrade!
I very recently drove on a very poorly constructed and maintained state highway in Arizona (St. Hwy 89).
Last year with the stock Rancho's the drive was unpleasant to say the least.
This year drive with DSSV's installed was a much improved driving experience.
Highly recommend this upgrade.
Damn, you've got to be beyond frustrated. It looks like you have documented things well. Not sure where you reside but Lemon laws exist for a reason and that documentation, should it become necessary, will come in handy.
Not sure which manager you're dealing with but if it's the Service manager and he doesn't call you back as promised with a clear plan to make it right I'd speak with the General manager. Then the owner if that yields no fruit.
After that it's Defcon 5. Banging the drum with GM corporate. I'd start with the CEO. Contact a Lemon Law attorney if that option is available to you (and you've satisfied the requirements). Banners on a trailer parked in front of the dealership.
My comments may seem like I fly off-the-handle easily. I don't.
I was thinking of your dealer having a laptop connected to your truck while you are actually pulling the trailer. I think I would tell them if you can't spare a tech to ride with me on that drive I'll be back in XX minutes.
GM and your dealer should be taking better care of you. There must be a way for them to hook a laptop to your truck to monitor parameters while you recreate the problem.
If they continue to yank you around I think I would put giant banners on each side of my trailer with a not-so-great testimonial and park it in front of their dealership.