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Tools + Supplies
ShadowRockYou have been an admiral son and your Pop should be very proud. The fact that you are learning and understanding what you are doing is a trait to be admired. To others who have seemingly scrutinized and criticized his work pointing out faults that he will learn over time but not from ridicule of effort, if you could done any better, YOU should have been the one to put up the instructable. OOH-RAH for this youth ....
Next time use a water level....a post with a jug and a clear poly line incorporated into the jug with a magnetic block at the end of the line to set on the frame of said trailer. Setting the height of the jug sets the height of the water (auto anti-freeze works best) in the tube and you measure the height of the frame at several places don't have to keep moving level.
as far as GFCI's go you can also tie some of to regular outlets so that they act with each other "that is" from one GFCI covering itself and in some cases 2 other regular outlets. This should be done with probably 20 amp outlets especially if they are at least 12/18 feet apart.In mobile home construction a bath on each end of the home is covered with one 20 amp GFCI used as with my home 80' long