a piece of lead the size of a helmet would weight about 200 lbs. if a tech man saw you bringing your helmet to the boat on a hand truck, i think he might get a little suspecious,,,,unless u could just throw it under your arm and walk over there inconspicuis ??? also in most series ,,,the 3 i raced in this year we had to remove the helmets and jackets, it,s a neet idea tho.,,, i,m going to build one for fun ,