I use cardboard boxes and painters plastic to get a feel for the full size floor plan of the new cargo trailer camper conversion (we need a better name – leave your ideas in the comments).

I also used a meter to test how much water is used in a typical RV shower and washing the dishes. It looks like our planned 50 gallon tanks are going to work, but only give us about 3 days off grid.

Link to the water meter I used:
https://amzn.to/2hCeIvk