Re: Looking over new full-size trucks, finding only Class III hitches (5000lb max)
I know for a fact that most of the new domestic trucks are already wired for the tow package, and they just don't provide the plug in harness unless you order the tow package, but the connections are still there, I have also found many people don't even realize they have all the wiring, it used to be with both dodge and ford, the wiring harness was often times, put in a box and stuffed under one of the seats and have seen many trucks traded in that were hardwired and the plug in harness was still under the seats, salesmen neglected to let the customer know it was there.
The demand for towing created a situation, that it was just easier to box it and put it in the truck, but you can also order the factory wiring harness through the parts depts of the dealers or less than $100..
Many trucks, didn't have the hitch installed because the truck was not speced out with a towing package, but check under the seats, and look at your fuse blocks, I bet you will find there are places to put fuses in and check under the cab, and you will find a plug in, perhaps wrapped with tape..check under the rear bumper and the plugs are there, or they are tucked up inside.
This has been standard practice on many trucks since the late '90's In the RV business, we used to hardwire everything, until such time as one of my tech's pulled a harness out and we got to checking, and sure enough it was the complete system for trailer towing, with the plug under the dash to put the trailer brake control in..