Weren't the 70s great? I can't even imagine my parents considering this, but then we grew up in woods and were falling out of trees by 4.
My older brother and I used to fight to get the top bunk practically every night, still have a scar under my chin when he pulled me down the ladder.
Get him some Dora the Explorer sheets and he's good to go.
j/k Joel, sounds like a great moment in dadhood and any kid that can drive a 4-wheeler gets the top bunk in my book, besides, your 2-year-old needs someone to look up to, no pun intended.