lol i was going to put the 4000 under the hood... even moved the radiator a few inches... but in the end the 4000 is too long to fit up there... 13" so i said eff it and threw it in the back with the 8400. and yes you can daily the 8400. i plan on 2 more 4000's down the road when i upgrade what i have... already have some plans for it...