re: Buying investment properties...

I wouldn't tie my land up with anything residential if you think it could be within the next few years that it may sell.

You may actually discourage buyers as the mess of evicting the mobile homes could be more than what a company may want to deal with.

You could cost yourself a deal or at the very least getting the best deal possible for that land.

Also, once you stick residential units on it you may have a harder time getting it rezoned.

ETA: If you want to put a small investment on the land while you are trying to sell it stick a billboard on it. Another uncle of mine has a few including one digital one and does really well with them.

That close to the interstate you would have no problem renting it out.