Im thinkin of buying a water fed pole ,and im not to sure on my requirements.ive had a booklet from reach n wash and im waitin on a tucker booklet.im not going to be using it every day but i do have commercial work 3 storey stuff which one would come in handy,most have outdoor taps,so would i need a van based one or would a smaller trolley version be ok.all my work is based on a monthly rotor.also the resin how long roughly does it last .