When you order Zenith amphibian floats you have to chose between operating your retractable wheels either by a hand pump or electric pump. Zenith does not price either pump differently...but if you want a hand pump to back up the electric version its an additional $1000. The hand pump must be mounted between the pilots legs so it can be operated by the pilot. The electric pump can be mounted in the rear and operated with a single switch. Both pumps weigh the same. Do any of the builders have opinions or experience with either of these set ups?