i have a 00 sportster and bought it specifically to board behind. i run 2x250L sacs, one either side of the engine and about 100L in the nose.
drop the wedge and good times. not much room as has been said, but pull the back seat out and with only 3-4 people it is all good.
it obviously wont be a huge wake but for a 20' centremount they pump out a very respectable wake. here is a photo with the weight above,
75' rope and about 22mph.