Maximum load for a Gen 1 is 386lbs according to the owner's manual.
Also from the Gen 1 manual:
"Do not glide for long periods with the engine off, and do not tow the motorcycle a long distance. Even with gears in neutral, the transmission is only properly lubricated unless the engine in running. Inadequate lubrication may damage the transmission."
Yep, bad grammar in the manual. You'd think these things were made in a foreign country or something!