Does the 2000 Dodge Durango SLT SUV have a “Quick Plug” that would hook up to a CURT 51120 Discovery Brake Control?

SOURCE: 2001 Dodge Durango SLT 2wd

Inspect the rear brakes for contamination from a possible leaking axle seal.

SOURCE: 2000 Dodge Durango SLT 4wd - turn signal is

these vehicles do not have flashers, it is the turn signal switch in the steering column it is called a multi-function switch!
That's where your problem is!!

SOURCE: 2004 dodge ram 1500 slt wiring diagram for hooking

Try http://www.etrailer.com/faq-wiring.aspx. If it is factory installed, there should be a plug in next to/behind the parking brake pedal... at the top. Not easy to see or get to.

SOURCE: location of air pollin dust filter on a 2000 dodge durango slt?

The dodge Durango does not have a cabin air filter (pollen/dust filter) The only Dodge to have an dealer option to include one is the Dodge Caravan

SOURCE: 2000 Dodge Durango - P1757 GOV Pressure Not Equal

I have had to replace the governor on those dodge transmissions, and there is a filtering metal mesh screen around the governor inlet port that seems to always get plugged up with small metal shavings. The governor is located under the transmission pan to the rear of the main valve body.