If you can talk to them on the phone they should be able to help you through everything (unless the DW is in labor at that point
).
If the friend has an RV and is an electrician he should be able to help you out too.
Everything on ours worked when we bought it, and is still working now (except the side A/C that we ditched and put in a microwave instead).
Bring along a digital camera and a laptop, and if you have TM questions, maybe you can use the friend's DSL or whatever to connect to the board. No matter when I check the board, there are always people signed in.
GOOD LUCK! I hope you find a good TM. We were so excited when we first saw ours, it was a dream come true.