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Pay attention, tailgaters ... UFC star Eddie Alavarez is about to show you how it's done -- 'cause he just copped the most awesome $143k tailgating machine ever!!

Here's the thing ... Alvarez is from Philly and he's a HUGE Eagles fan ... who loves to tailgate before football games.

How do you do that if you're a big-time UFC star?

You do it in a Winnebago Era (new ones starts at $142,925) ... which is a tricked out luxury leisure machine built on a Mercedes Sprinter van chassis ... which Eddie hooked up with a TV.

"Hell yeah man, we got a RV now. I got a RV where I can head down to the stadium to tailgate," Alvarez told us.

"It's pretty. It's real pretty. We took it to a concert about a week ago and it was the talk of the town. Everyone was surrounding it."

Of course, the cost ain't a thing for Eddie ... he's the main event at UFC on FOX 30 Saturday where he's fighting Dustin Poirier, and we're guessing he'll make his scratch back.