Like I said, mechanically, I'm fine. I farm so I fix and maintain all my equipment....Electrically, not so much.
The inverter install was seamless. I installed it very close to the battery that came in the unit and used welding cable and crimp / solder on lugs for the connections I bought an over rated Xantrex (3000 watt) when I knew I'd need much less (the CPAP machines is 75 running watts) 'in case' of future need and I hard wired the converter to one dedicated GFI outlet near the overcab bunk so I can 'plug in' but still have the outlet available for other stuff in the future.
The Xantrex is a remote on and off unit and it's efficiency rating is 93% not 80 like a cheap convertor (wasn't cheap)
If I remove the existing battery box and venting, I can get 2 group 24's side by side in almost the same space the box now occupies, not a bad deal. With a slide in TC, you want to keep 'dead' weight as far forward as possible anyway.
Thanks for all the replies, I appreciate any and all assistance.
My last question is (and lets not get into an oil like discussion if possible), what do you folks recommed for an AGM battery? Years ago, I used an Optima in another application with very mixed results. It was expensive and trally didn't work out very well. Are there other more viable options?