I dismounted my workbench vice when selling my house, mounted it on a 3/4 inch thick square of plywood. That plus a few small C clamps makes doing jobs on the RV park picnic table (or the trailer steps) much easier. I also use the C clamps to clamp my flag base to my MorRyde hitch plate.
After my adventure yesterday removing the broken off stubs of mounting screws on my rear trailer stabilizer motor mount plate, I can HIGHLY recommend a pair of 6 inch nose-type vice grips. I was able to turn these screw stubs just 1/8 of a turn at a time, working the screw threads back and forth to smooth out binding, and got both out after a little time was invested. I tried drilling the screws first, and this didn't work. Without this tool, I would probably be buying an entire new rear stabilizer assembly.