Thanks
deplorablemike and
RY469 not only did your posts spur me on to find a solution, but got me pointed in the right direction. It turns out it was a bad breaker. Everything was wired correctly and it probably left the factory working (my assumption only). Once a new breaker was installed, all was good.
Also, for info, when I wanted to use electric heating, I simply ran an extension cord from the water heater to the outside receptacle on the trailer, worked great, just not pretty.
Thanks everyone.