Dunno
U-Haul used to have a small trailer that looked like a cargo container for a car top It was tiny and I think a motorcycle could pull it. Didn't have them everywhere though.
Just make the kids take all their old clothes you want them to get rid of and throw them away as you go! Use a vacuum packer to squish everything down so it will pack flat and nice. We always buy a couple tee shirts when we are at events so we pack a couple less on the way up. Pack your Bug like a submarine. Every spare inch of space gets used. Pack stuff under the spare tire, stuff things under the seats. Strap the kids to the roof. Whatever you have to do.
The radios are all pretty much the same these days, there will probably be 30 different kinds up there and as long as they are tuned to the same channel they will work fine. Sometimes too well as everyone loves to pint out that they saw a bird or a goat! "Hey Look everyone! A Tree!"
I live in Jacksonville so probably will be in the Fl Carabugvan up. We do/have met at the Sonic drive in the night before. Kinda a ritual type thing now.
Chuckie