Aaron Coolidge wrote:
CG envelope a moderate amount, so that the situation of 2 * 200 lb front
seat passengers + fuel + no rear seat pax or baggage is within the CG
envelope. It is purely a paper change, you get a new CG envelope sheet.
It came with my Cherokee 180, and I believe that it applies to straight-wing
Arrows too (ie, PA-28-180 and PA-28-200).

Aaron:

Do you happen to know the number of the SB from Piper?

And I keep an 8 gallon (with only 7 gallons in it) water tank in
the baggage area. Works perfectly!