Replying to Building a ski bum van!

So after months of careful consideration and after an upcoming deployment I will begin to build a van to hopefully go across country and ride random mountains. I plan on getting a van stripping it on the inside and building storage, a bed (or 2), and hopefully an area with a mini fridge and microwave (not full on kitchenette just fridge and microwave). I have a few questions though.

Here they are:

What will be the best kind of van to look for?

Best way to get power to the van?

Best way to heat the van?

Best way to further insulate the van?


Any advice would be amazing let me know your experiences.