As others have said, don't do it. They will not provide enough power to run the EXPO EXTREME roof lights you're imagining. They could be used to trigger relays, but then you'd still have to run larger gauge conductors for power and end up doing the work you're hoping to avoid.
Also, no amount of discount is worth the headache to work with a dealer with those kind of ratings. Put another way, how much would they have to pay you to put up with the spectacular BS that awaits?
Also, also - as other parents have already said, getting out > perfect setup. But, I would be lying if I said it doesn't help lol! Our kiddo did not sleep anywhere, ever. We had a similar setup to what you're aiming for but in the end, it was still suboptimal. We just finished the "perfect" camper and it works great. The main reason it is successful though is because we have camped with our baby in a suboptimal setup to evolve to what has been pretty great.
