Please give us the mass of ships in the description. The agility rating a) does not give enough detail, b) is often inaccurate (see cents) c) doesn't allow for it to possibly become dynamic in the future (ie cargo/weapons/bats/ships etc all could have their own mass, and your rig would then have a total mass).

EDIT: ooops a1 already said yes to this suggestion... before I put it in the appropriate location.