We are on our third "Last Motorhome we will ever own!" so I don't think you can ever pick your last rv first. You find things you wish you had, but also find things you know you need along the way. I like the idea of doing your research and this will help to narrow your choices, but there are too many things to know and many more options than can be counted. The fun is in the adventure for us and it can't be any other way for us.
One thing that I don't agree with is not telling your insurance company about being a full timer. You save money by not telling them, but you can get a worthless policy with no coverage if you are found out and the money you saved won't mean anything. We were up front with our insurer and it is more expensive, but we know we are covered. Besides being the right thing to do.
Good luck. It is quite a ride.