Jocko, if you run 125' of 30 amp cable the voltage drop will be extensive. When I need to go a long distance I use 50' of the 50A cable and then go down to the lighter 30A cable. This gives me much less voltage drop.
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Dave & Barbara
KenWorth T2000
2005 Mobile Suites 38RL3 #2338
MorRyde IS 8K axles, LazyBoy recliners, LCD tv
Full time since '96
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