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Sweet, I actually can offer someone else some help! At least on the first question.
We just purchased our first A/S and before the ink on the title is dry (the check for the trailer hasn't been cashed yet), I have already fixed 4 splits (3 in the trunk and 1 under the curb side twin). I purchased 1/2" ID (inner diameter) soft refridgerater copper at Home Depot. The pipe cuts in my trailer were a fair distance from the actual split as the ice swells the pipe quite a distance from the split. The fittings on both ends of the worst split had to be heated to pull out the whole section. I recommend using a very wet shirt against the wood floor and any wiring you want to protect, and a metal heat reflecting shield between the wet shirt and the pipe being heated.
I assume the pipes didn't change too much between '72 and '75. It might not be a good assumption.
__________________ Mark 
72 Sovereign: L couch, mid-twin, rear-bath "When you come to a fork in the road, take it" "It was impossible to get a conversation going; everybody was talking too much." "If you don't know where you are going, you will wind up somewhere else." - Yogi Berra
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