How do the aftermarket remotes work with the immobilizer? I've thought about that route but storing a key fob under the dash so the truck will start isn't work the security risk. I really like the fact that if I park my truck remotely it will be there when I get back. If you're motivated enough to skid an 8,000lbs truck onto a flatbed and across 100 miles of dirt road you can have it.
I have a CompuStar remote start system in my '15, it works well. No issues with the immobilizer. However, the engine does shut off when you open a door (but not the hatch, for some reason). Range is very long, I've haven't really tested it much but 1/2 mile is possible if I'm outside. I have the nicer remote with feedback that tells me if the engine is running. There's all sorts of programming stuff you can do, like making it keep the truck at a certain temp (it will keep restarting), how long to run once started, etc. But ya it's a pain to carry 2 fobs.
Hiding a fob under the dash? That doesn't seem like a good idea. Doors won't lock!