Hi, OP here. Thanks for all the responses folks.
I've continued my research and found a couple of videos from Trailer Life.TV. The first point made was that the repair kits at the RV parts stores were not a permanent solution. What they did say would work on small holes and cracks was akin to welding. Using a soldering iron or small torch and a piece of HDPE (tank material) one would heat the area around the hole and using the piece of HDPE melt and weld the hole shut. On the crack repair you would drill a small hole at each end of the crack (to keep the crack from spreading) and then do the same thing. I was able to go to a local RV dealer and obtain a small stick of material that they use in their plastic welder. I'll let you know how it turns out.