I searched for a thread on Nevada registration requirements, and didn't find one, so I thought I would share my experience here. I just purchased a bus located in Colorado and my husband will be picking it up later this week, then attempting to title/register it in Nevada.
I called the DMV and said I had purchased a bus which is undergoing a conversion to an RV. After being transferred to several different departments, my call landed in the Emissions Lab, which seemed to have the most information. They said you change the bus to a Nevada title (I have 30 days to do this, during which no insurance is required, since the bus will be declared non-operational), and then proceed with the conversion while still titled as a bus. After the conversion, you fill out an affidavit of non-operation and they give you a movement permit, which gets you to the inspection location.
The inspection has two parts: interior and mechanical. The mechanical/safety inspection is based on form VP-64, which can be found here: http://www.dmvnv.com/pdfforms/vp064.pdf
But the interior inspection happens prior to that. To qualify as an RV in Nevada, a vehicle must have:
1) Sleeping quarters. I asked if that meant a framed-in bed. He said yes, it couldn't be a mattress on the floor.
2) Cooking quarters. A Coleman stove on a countertop wouldn't be enough; it needs to have a plumbed kitchen and any cooking elements should be built-in.
3) An eating area. It didn't specify built-ins, but he said everything needs to be permanently attached.
4) A restroom with toilet and holding tank. I told him I was planning to install a composting toilet, which would not have a black tank.
Answer: "Then it's not an RV."
"So you're saying that no RV registered in the state of Nevada has a composting toilet?"
"I'm just reading what's on the paper, ma'am."
I'm not sure how that works. Short of registering in a different state (which is still a possibility), I'd appreciate any suggestions on how to get around this. The conversion requirements look very strict, although I can't find them in writing anywhere on the Nevada DMV website.
Additionally, vehicles over 26,000 GVWR are exempt from needing a CDL when classified as an RV, but Nevada does require a non-commercial class B license when >26,000.
Again, this is just my experience. I hope others will have more to add.