I finally got everything I need to proceed and hopefully finish up this project. Following is what I have done so far -please critique.
I went with the MC4 to SAE adapter, mainly because I have very limited wiring experience, so it was simple. As suggested, I checked the polarity of the wires in the camper and they are reversed. I bought a multimeter, which also have zero experience using, but figured it out. I set the solar panel on the ground, titled to directly face the sun, but the panel is partly shaded due to tree leafs.
I plugged it into the rear solar plug. I took the two wires labeled "rear solar", and using the probes on the multimeter it showed positive 1.30 amps when the black probe touched the red wire and red probe touched the black wire. Reversing the contacts, it showed negative .7 amps. I also tested the battery posts, red to red, which showed positive 12.78 volts and that is exactly the number I get with my new battery charger so it seems the multimeter is pretty accurate and I think I am safe connecting the solar wires in reverse to the Morningstar solar controller.
There are also a red and black wire labeled battery to be connected to the Morningstar controller. Am I correct they should be connected red wire to positive and black to ground,i.e., not reversed? And I think the same goes for the red and black wires in the battery compartment labeled "solar battery" and I have a 30 amp inline fuse for the red(hot) wire.