half ton? If I was headed to a friend's house who owns a farm and they asked me to pick up half a ton of farm supplies I would think nothing of it. Even my truck with its tiny payload can carry that around
Who knows man, maybe feds caught him with some pot plants and now he's setting you up in some sort of bullshit anti-terror sting to cut a deal. Regardless of what kind of truck you have, casually buying half a ton of fertilizer for somebody else is an odd request that warrants some explaining.