Found a Used/Salvage RV Parts store
Stumbled upon this place watching youtube.
Never even occurred to me to look for a RV "junk yard".
Haven't bought anything from them so this isn't a recommendation.
I've got them bookmarked and will check them out next time something big breaks.
2013 Winnebago Journey 36M DP.
1987 FJ60 Flat Towed, Blue Ox Tow Bar (not recommend), SMI Air Force One, 2000 Watts Solar, 600AH LifeBlue LiFePO4 batteries (excellent).