Looking for input on fuel safe style bladder tail tanks on a mini sprint. i am not reffering to the fuel safe brand specific, just any bladder that style. We are currently using the rci with the metal housing and plastic bladder. The tank holds 4 gallons and we have not ran out of fuel in a feature (gasoline) . It is a little inconvenient to pull the tail section to refuel, but in my opinion that alone does not justify the extra money for the other style. One big question is about squaring the axle and gear changes, seems to be a lot more room with the more expensive style bladders? Any info is appreciated.