One site that I found a year or more ago was Life Remotely. They converted their truck to accomodate 3 people traveling from Seatle to the end of South America. They camped in tents most nights and some hotels/hostels but did a lot of conversions to their truck. Plus they blogged the whole time which is pretty cool if you want to take the road trip international.
This style of saw will provide more power than a contractor-type saw and have the high-quality rip fence you need to do good work. However, because they are favored by professionals and serious amateurs, cabinet saws are harder to find on the used market. Scour the classifieds and online sales (be sure to check industrial auction sites as well), and do some networking. Check the bulletin board at your hardwood supplier and ask the proprietors if they know of anyone selling a saw. Also call local cabinet shops. They sometimes have a surplus tool sitting idle that they’d be willing to sell. Take your time in this step. A careful investment will pay dividends in the long run, but a well-intentioned compromise can cause long-term frustration.
The refrigeration setup in your van is an area where you really do get what you pay for, whether you’re paying in money or in time. The best options are the most expensive. The cheapest options are a pain and/or don’t work very well. And if you try to save money with a DIY refrigerator setup, you could end up spending a lot of time on installation.