I have a Sears car-top carrier, I put it in the back of the pick-up, cover the pig with ice and close the lid. I have carried pigs up to 250lbs that way. Plus they will keep very nicely for about a day and a half without adding more ice.
500 gal. Carnivorous Spirit tank smoker, 22.5" weber, UDS, 1 gas weeny warmer