With your age of rig I would do the two 40 amps if you do anything other than replace the 50 amp one. Keystone replaced mine, under warranty, with and 80 amp but they indicated that the wiring in the newer rigs can handle that. They didn't indicate what year constitutes newer so before I did that I'd call Keystone customer service.
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Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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