We are installing a Butler inclined platform lift that will transport our son and his future chair down to our basement. We are ordering it before we have his power chair because I can't continue to carry him up and down the stairs. I need to know if a 48 inch long platform if long enough for power chairs. Can some of you give me the lengths of your son's chairs? BTW our door is 36 in. wide and the platform will be 40in. wide.