If you want the renter to take care of the lawn himself, I would definitely put in a storage shed, even if it's one of the plastic Rubbermaid ones.

A plastic drip pan.2.

Also taped a funace type plastic drain hose to garden hose from dehumidifier and ran it directly into floor drain & zip tied it to drain.

Pretty sure it would cost quite a bit more than placing the unit on a plastic slab next to the building though.

Loosen the 4 screws and remove the 4-prong cord.Usually, you will have three screws in a row on a plastic terminal block, and a fourth screw below or above that, that goes directly into the sheet metal.When the dryer was shipped, there was a metal strap, about 1/4" wide by a couple of inches long, from the screw in the sheet metal, to the middle screw on the plastic terminal block. 

They could do the classic "shove everything to the middle", and I'd throw plastic over it, but it's more work for both them and me.Question: Is this a reasonable thing to offer at this time? 

Often it won't be a replaceable filter like a whole-house furnace would have, but a piece of wire or plastic mesh that you slide out of the front of the unit, wash, dry, and reinstall.If you get funky, musty smells, unplug it, and take the entire plastic front off of it. 

The 1 inch plastic ones sag and discolor,  the metal ones get bent out of shape in no time.   

(green counter tops from the clearance rack, pink plastic backsplashes on special, etc.)4.

Just junk lying around, plastic crates, dirty old piss jugs(!)