I also like to wrap my games in plastic wrap before I move them. This does several things. It minimizes scrapes and other minor moving damage. It keeps the wind from catching a loose monitor bezel or marquee and ripping it out of the cabinet, it keeps you from getting a heavy coating of dead bugs on the game if it is a long trip, and it keeps your game relatively safe in case of snow or light rain. Heavy rain is still a no no though.
If moving one cabinet in a pickup truck, then I lay it down. If moving two, I lay them down if possible. If moving 3 (or 2 that won't lay down), I stand them all up and strap them firmly to each other, and then down to the truckbed from there. When standing them up make sure that the fronts of the machines are not facing forward, as you don't want your glass or plastic parts to catch any stray flying rocks.
If you DON'T have a big roll of the warehouse/shipping style plastic wrap, then you can use the kitchen kind. Figure a roll of the kitchen kind will cover 2 games. You have to go around the games many more times with the thinner kitchen plastic wrap though.