How do mobile homes get relocated?

[Steven J.]

Those of you with experience moving mobile homes I'd really love to hear from. 

I'll have a possible opportunity to pick up a few homes in a park that is closing down but will obviously have to be moved. What are some of the questions and information I should get when I'm calling up moving companies and interviewing them? I know some parks discourage homes older than 19XX, are there similar rules and regs for moving them alltogether? I suppose this is probably a county by county thing in many cases as well - who would I call about that?