Humidity would be another concern. On cold mornings don't power up the ps2 until the inside of the van (and the ps2) is warm. Not doing that won't cause immediate failure but the condensation will accelerate debris buildup and corrosion. Combined with vibration that'll quickly age any electronics.
The ps2 wasn't designed for mobile use. If it'll see lots of use while driving I'd make a bungie-bed. Just a frame around the console attached to another frame with bungie cords or similar. I've seen camper drawers & cupboards used as the outer frame.
Have you powered it up yet? You could run into issues with your inverter. If the PS/2 acts strange, intermittent, or won't boot (but works when plugged into a household outlet) then it's probably your inverter's output wave. Low cost versions put out square or poorly approximated versions of what you get from grid outlets. Some equipment doesn't mind, some does.
Take jumper cables.
