I have found that showering can be a little bit tricky at times when I am on the road. I usually go for a swim (not using soap in this case, as it pollutes the water) or use a bottle of water to have a quick wash. When I can I stop in at the local pool and pay for a shower.
I was looking at installing a 12v shower in my van but I don’t know how great the benefits would be. Let me know how you get around this issue when you are on the road.