The trust should have precisely **** all to do with arranging pre season, which should be entirely based around what the manager feels is necessary to get his team ready for the coming season. It's for the players to get fit and bond, not for the supporters to drag themselves along for the ride. Enjoy something non Cobblers related for a few months over the summer; it's a big wide world out there and it isn't all claret coloured!
It's perfectly viable to do both as you will see other progressive clubs doing except in this case cos the club organises it it's deemed beyond critique by some. Get the small things right and you'll build a decent club.