i use the squad of grey hunters with termies in to provide cover fire and guard objectives, so they dont go anywhere and therefore dont need rhinos. although that may only be useful playing against assault orientated opponents which is what im generally against.
ive got the extra wolf guard i need for the weapons in a squad that does attack i could put them in a rhino, and i got a big blood claw squad for attacking, but i feel that the grey hunters with termy with gay heavy weapons, are definately alot more suited to a stationary support fire role. i would use long fangs but they arent a scoring unit or as big.