well i completely (almost) made up for my $12 mistake.
I work at a RV/camper dealership part time. and get some good deals sometimes.
For legal reasons the dealership will NOT install a new plug end on a Used cord on any camper/RV they are selling. They replace the entire cord.
I was
Given for FREE a 30 foot or so 50 amp cord with no ends.
So I ended up with over 100 feet of #6 Multistrand COPPER wire
#6 is not my first choice but it will work since there will be so little draw on everything.