However, I was instantly concerned about the lens, the glass was, remarkably, ok, but the leaf shutter is jammed up, going to cost $125 for a new shutter.
Chuck, at the price of 90s on fleabay, it will likely cost you more to replace the shutter than it will to get a completely different lens. As to the RB as a field camera, this subject keeps coming up over and over. Each time the concensus is the same; there are those who say its great, those who think its too heavy, and those who recommend a Graflex or Bronica...
I have found the bodies and lens kit to be great for field use. Its best to get a quality backpack to carry your kit in. Although there are those who will immediately say, OMG, I use a Tamrac Expedition 8. It holds two bodies, three lenses, filters, flashes, grips, WLF, prism finder, several backs, Lindahl shades, film, and other accessories. While this might be overkill for some, the whole thing weighs in at about 40lbs and is balanced well.
For lighter duties, a smaller backpack is in order. Working crowds, events, small off road adventures can be done easily with an OpTech strap and trigger grip. Use the WLF finder.... I have found little use for a prism finder outside the studio.
As stated, things to look for are bad seals on the RB and RB Pro backs. This can be totally avoided by the Pro SD back which does not use seals. The damper foam for the mirror goes too, but is easily repaired. Stick with the SD series and you will usually avoid bellows or mechanical problems unless the camera has been beat to death commercially. The SD also allows the use of both C & KL series lenses with an adapter.
But, like the others have said, if you absolutely have to include movements, an old Graflex style is the way. You can even move up to a much lighter and 4x5 capability (in addition to roll film and Polaroid) by going with the aluminum body Super Graphic or the Busch Pressman D. The Pressman is a very reasonable alternative to the Super, and even has more range of movements. All of your 4x5 lenses will work with either of those...