I use an old B&J which weighs 17# with the lens (300mm Symmar-S). It is rugged, stable and a pain in the a$$ to lug around. It is an excellent value, works well, sets up easily and does a good job.
I made a reducing back with an old Graflok back and a used parts back. Great combination for long shots with the 300mm lens, very sharp, and wonderful to focus in 8x10 format. The original glass is still in place, but it is fairly coarse when compared to a newer typical 4x5 ground glass.
Biggest down-side is the weight and bulk. Unless you are willing to do a bit of lifting and walking with this beast, you won't be going very far from the car to shoot. I got an old Fujinon aluminum clad video lens trunk which holds camera, film holders, lens shade, dark cloth, meter and other odds and ends too numerous to name. Add the Bogen 3051 with 3047 head (another 17#) and you have a chiropractor's dream come true.
Too bad it takes such nice pictures!