I use my paracer as my cargo transport dino for short to mid distance. I use it to go to the redwood nearby and gather MASSIVE amounts of metal. Just hop off, get the metal, load up the paracer, then get back home. They can defend themselves quite effectively
A must tame because they are a mid-game mount and usually platform mounts are mid to late-game. So be sure to tame one but note: They run out of stamina pretty fast so I suggest you pump stamina into it.