Just a thought from a casual observer, but I recall flying some in the States with 50lbs of lead shot in the luggage compartment behind the seats. Without, it would have been very close to, if not exceeding forward CG limits with 2 people up front.
That's a problem I find with any 28, you can't have two hefty guys in the front and full tanks. I heard (don't know if there's any truth in it) that some 28s have the battery in the back end which relieves the forward CG problem.
I've flown with a bag full of house bricks in the luggage compartment before.