I was thinking of getting a sander . 1.What is a good one to get to do small lots about 100'X 200'. 2. How do you maintain it in the winter do you let it go empty and wash it out or let the san/salt mix stay in it. 3. Steel or satinless. I have a fisher speed caster 2 now but was thinking of getting more sanding contracts.Loading it would be no problem because i have a 580L 4 X 4.Would apprciate any help.