It seems that all of us are trying to get two tons of fertilizer in a one ton truck. I have a roof rack on my Chevy HHR for all of the poles. Containers are convenient for keeping stuff together, but can be counter-productive. Cars are irregularly shaped on their insides, so containers tend to leave a lot of "free space" around them. If you have a trailer with vertical sides, this is not a problem. I pack all of the containers in the center of my vehicle, and fill in the voids with loose "conformable" things (tent, ground cover, ropes, etc). You can also use these things to fill any voids in the containers. And don't forget the Navy's tradition: roll your clothes, don't fold, they take up less room. In fact, roll all of your material items. I have tried vacuum sealed bags, maybe someone has had better luck with them than I have.