on a 2001 Trooper the engine data plate says ENG-RJQ TRANS-RMQ what does that mean

What is your question?

Am thinking of purchasing a 2001 Trooper. Is a RJQ engine a 3.2 liter V-6? And does RMQ-trans mean it has 4L3 0 E? if the trans does not engage is that usually an electronic controlled problem or is the problem with the transmission normally? it makes no sound of engaging at all. Since the 4L30E is an old GM product (I think) and the fluid level and color is good - could the filler plug have been left open and therefore not have pressure to operate? What should I be looking for and about what will it take and cost to make functional? Will this vehicle tow a 1983 - 25' Wlderness camp trailer? respectfully, Chad