You can use the platform on your little guy to rack your source of water, a pump and 10 ft hose with shower head and you're off to a clean start. I put a stool and sit down while I shower but these things are big enough to stand up in no problem.
Here's my set up with a Little Guy 6-wide: That's a "Reliance" 8 gallon jug that sits perfectly on the Little Guy Platform. It has a large top opening so you can easily drop your pump down into it and it's on wheels in case you ever want to roll it away from the tear.
Scott G.
Outback Porta Privy
Reliance 8 gallon Hydroller