We are traveling/sightseeing in a converted Transit cargo van (not fulltiming) and LOVE the nimblness and ability to go anywhere, including narrow city streets and get around in heavy traffic. (In our case, we needed to be stealthy because our condo rules only allow RVs for 24 hrs for loading/unloading; but a "van" is allowed) One of the biggest problems a "regular Class B" presented was not enough length on the beds for Ed (6'3"). So as you look, be sure to try everything for size. There are also many companies that will build to your specs: Sportsmobile has been around for ages and shows a dozen floorplans available on their website. Custom-built lets you pick which items are important to you; in my case, we tend to utilize RV parks, so we didn't need to waste space/money on a shower or generator. Utilizing a porta-pottie eliminates a black tank to dump. You will lose a TON of storage space going from an A to a B, but there are lots of people out there fulltiming in vans. My favorite website is www.faroutride.com who have given a detailed journal of their van conversion and journeys (Antoine and Isabelle are both engineers who have taken a few years off to travel Canada and the US, pursuing their love of mountain biking and skiing)