The very first bullpen carts began appearing in baseball in the late-1950s. Below is one of the very first prototypes:

The look evolved a bit in the 1970s, then the cars disappeared from the Majors, and then came back again in 2018. Now, they're transporting relievers to the mound at the Tokyo Olympics. And, well, just look at them.

This is like a bullpen limousine. All former big leaguer Jumbo Díaz needs is some champagne, music, a TV and maybe a hot tub to warm up before he takes the field. These should replace cars. These should replace homes.