I have a 24x24 softbox that I will TAKE with me to location shoots, already set up, and with the flashhead already mounted. I have a small wagon type car, and with the back seats folded down, the softbox rides in there really great. But I actually prefer umbrella boxes for this: EASIER to set up, faster to set up, and 50 times easier to carry. I have a small hand-truck type cart, with a large rectangular carrying bed that carries an 18-pound Tronix Explorer battery/sine wave inverter, and either a D402 or D202 power supply, and two flash heads most often, one to use, and an MW3U as a backup or fill/background light. This stuff is my "cheap" "oh, well, if it gets stolen,no biggie" location lighting gear. The 18 pound sine wave inverter and the 5- or 14-pound battery packs act as ballast for the hand truck, and a 9-foot light stand is mounted to the upright (collapsible/lock-able/) handles on the hand truck, so I can move the inverter/power pack/lightstand/light head as one, single wheeled unit. With the 18 lb. inverter +14 lbs. power supply acting as ballast, it is wind-proof.