Your missing the wiring harness/plug for trailer lights...and labor.
I installed aftermarket on my 20 explorer, and the 18 edge before that, both without the wiring. Theyre a bit of hassle to install, a second set of hands is very helpful. Both required exhaust to be lowered. Explorer required...
On the subject of Mid package causing the manual trans to drop and the possibility of the remote start being the cause...
for BD at least-if you open transmission details the 7M states it "requires 2.3, includes granny gear and CRANK IN GEAR FUNCTION, and hill descent control.
If it can "crank...