Well, as you have figured out there are three choices.
The screw on type that will not interface with your truck.
The inside the wheel type that will not interface with your truck.
The OEM inside the wheel type that will interface with your truck.
FWIW, the screw on type that I have cost right around $350 with the booster transceiver needed for the trailer. It is a pure after market with a separate transceiver that I had to find a place for in the truck.
So, the dealer price, which includes a lengthy installation process, does not seem that bad to me.
PS the screw on types react pretty fast. Most of the time the alarm goes off within a second of when I remove a cap. My reaction to the alarm is MUCH slower
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