True. A lot of our supplies are already ziploc/vacuum packed, but would be simple to use a heavy duty trash bag in each container for additional protection.

However, another concern I have is security when on the road. Lockable containers might be a plus; not only secured to the trailer but secured shut (combo locks). Alternative is the WellsCargo mini that JohnN pointed out. The major benefit of the Sylvan is that it has basic shelter as a part of it (The tent stores up into the 'roof' of the trailer).

All this is moot until I can get the budget for putting a hitch on the van and then selecting a trailer.

That Sylvan Sport GO trailer is about the coolest thing I've seen in a long time! I currently drive a Chevy Avalanche so I wouldn't need too much extra space right now. Once I downsize my vehicle though, I'm going to look into getting one of these.