The mammoth package is a bling bling wheel package available with addition of the xp package. Available on any trim level you start with. Its the "mammoth" brand/style wheel with nitto tires I believe. They had other brands of wheel packages as well they were also named after which ever wheel was used. Other then that its just a normal tundra with the "xp" package which is a appearance package running boards, xp badging, probally says "xp" on the head rest on the seat, etc. I hope that helps