I would design some kind of ramp, either a permanent concrete slope on the ground that butts up next to the storage containers or a more portable ramp that can be moved from container to container.

My next purchase will be a portable battery shop vac to directly attach to some tools.

The first thing I thought of when I saw a 3d printer was that I wanted a massive, portable one that could take concrete as an medium.I've seen 3d prints of models from ArchiCAD, and I think it may only be a matter of time before at least some parts of a typical house get printed on site.

Then, it still always involves 2-3 trips to the plumbing supply store or Lowes.Table saw, chop saw, jig saw, roto-zip, rotary saw, 3 sizes of hack saw, sawzall, router, under door saw, bow saw, chain saw.....Battery drill, battery skill saw, battery flashlight.Many sets of drill bits and screwdriver bits, flat, phillips, star, hex, several pry bars, pliers, pipe wrenches, screwdrivers, wood chisels.......Tape, carpenter's pencils, utility knives, several sizes of tape measure, T-squares, and levels.....Buckets of plumbing tools, spare lengths of PEX, PEX fittings, PEX tool, PEX cutter, teflon tape, plumbers dope, under sink wrench......Electric plugs, GFI plugs, wall switches, wire nuts, wire strippers, and a new light bulb for every fixture in the house ebcause every one will be burned out......Compressor, brad gun, nail gun, finish nailer, roofing nailer, hardwood flooring nailer, assortment of nails, brads, screws, staples and the power stapler to go with them (both electric and pnuematic).Drop lights, halogen work lights, salamander heater, furnature dolly, saw horses, portable propane tourchSanders, 3 sizes, sand paper, power planer.....And there's more.

So you provide the cabin supplier, arrange all necessary connections and permits then hand it off to a PM and charge a fee for your services.So to do that all you need to do is go into local council and establish what the rules are for portable dwellings.

The entire servicing history and payment history needs to be completely portable from investor to investor and servicer to servicer.

If you think it will be too miserable and hot when you show it, you could just bring in a portable cooler as a temporary measure.

Those portable scanners that can quickly take receipts, leases, invoices, checks, etc and turn them into digital docs. 

Everything Paige said and a few more.All vehicles must be licensed, tabbed and operableNo water beds, pools, portable heaters, portable dishwashers, portable clothes washers or dryers shall be used on the premises without prior written consent of agent/owner.No dust, sand, dirt, rubbish, coffee grounds, feminine products or other foreign material shall be flushed or washed down toilets,sinks, or wash basins.

When I use to travel extensively, I carried one of their small portable scanners.