I have my main bench in the garage, but I also built a 2'x3' reloading bench on casters out of 2x4s and scrap plywood as top.
I bought 2 cheap plastic drip trays on clearance (I think they were made for catching mud/water off boots) and two trays fit just perfect on top of my portable bench. I have both single stage and progressive presses mounted on the bench with the drip trays cut around them.
I can reload anywhere now - living room watch TV in the winter, patio in the summer, even carpeted bedroom/office since the trays catch everything (powder spill, primers, etc.) and nylon wheels don't mar the hardwood floor. And when I am done, I can lock up the bench in the closet.
If static is a concern (not for spark ignition but powder sticking to plastic funnel etc, right?), how about using metal cookie sheets as your trays? Should be fairly cheap at garage/yard sales (I've seen them for $1 or less). If that's not enough, as Walkalong mentioned, you can consider grounding your press/tray and even wearing a static band (computer network guys wear them) clipped to the tray/press.