Well, I decided to proceed with the hard wired installed lights. I purchased this 2-pack,
27W LED Lights, recommended by Gdetrailer, and also purchased the 14 ga marine wire recommended by BurbMan. Since I'm only going to be pulling less than 5 amps, the 14 ga will be more than sufficient.
I decided to go ahead with this because I crawled up under my trailer this afternoon, and I already have grommets installed in the cross members of the frame, allowing me to easily run the wire from the junction box under the front of the trailer to the rear of the trailer. It should be easy.
I already have mounting ideas, but I will look more into it when the lights arrive.