From the author's README on Thunderstore

Back at it again with more Big L stuff.

this time i have 1 Deck and 2 Grips

the Deck is supposed to go with the grip labeled "Big L Skateboard".

its based off of the real life collab between Ricky Powell and Big L.

the 2nd grip is a custom board found on the internet somewhere...

Install BigL Skateboards

You need ReSkate and your own copy of skate. on Steam.

Open ReSkateLauncher.exe and go to MODS.
Search for BigL Skateboards and click install. The launcher also installs anything it depends on.
Press PLAY. In game, the MODS tab of the ReSkate menu (Insert) turns it on and off.

Or install it by hand: download the .zip and drop it on the launcher window, or unzip it into its own folder in Mods\ beside Skate.exe.

Maps show up in the ReSkate menu's level list. To join a server running a custom map, you need the same map installed. If the game won't load after installing, see known issues.

skatemods doesn't host or review this mod. The download comes straight from Thunderstore. Only install mods you trust, because scripts can run code.