My Plan:
I am going to use a plan using an idea placed on mine by the sited person.  Lets see how it turns out.

Originally Posted by No Misses on SUCBA Toys.com Forums

I experimented with PVC tank racks that I could put in and take out of the car. They worked well. But, they took up too much room. My latest setup is made of plywood (scrap from dumpster diving!). I made it with sides and a front lip so that it would "hold water". That way I do not have a bunch of salt water rusting out my car. I purchased 2 roll control tracks and 5 roll control folding tank brackets. When not being used for tanks I just fold the brackets out of the way. I added a rubber mat from Lowes so that my equipment could drain.

Plywood - Free
1 pint spar varnish - $5
2 Roll Control tracks - $40 ($20 ea)
6 Roll Control Folding Brackets - $60 ($20 per pair)
1 Rubber Mat - $20
1 pk of brass screws - $3