2001 LT 1000 CRAFTSMAN FUEL TANK SWAP

HAS ANYONE EVER SWAPPED THE FUEL TANK ON A LT 1000 MOWER FROM UNDER HOOD TO UNDER SEAT. I CAN'T UNDERSTAND WHY SOME MOWERS HAD THE UNDER SEAT TANK AND SOME DIDN'T. I MOW ABOUT 3 ACRES ON A TOTAL OF 4 YARDS, SEEMS I'M ALWAYS FILLING TANK.