Thats not the weight I am concerned with. The bike should be able to handle the laden weight.
The extra weight as in a longer lever to try and stand up out of a slow speed corner. Speeds above 12mph.
Why 12mph? That is the average speed where you have to lean the bike to turn instead of turning the bars left to actually turn left. Any slower and you lose the gyroscopic effect. When you lean into a turn with added weight, not including Travis. You may have to muscle the bike back upright.
Its the weight above the "stock backrest" Yes, any passenger is well above the backrest as none extend to the head of the passenger.
Uncharted territory and every thing must be noted and accounted for.
why would you think the C/G will be higher ? Whoever fab's the mounting bracket I'm sure will have the sense to mount the seat as low as possible
Also, how much could the backrest of the seat weigh ? Those that know how my wife & I travel will tell you, our Roadie is loaded up more than I'm guessing John's/ Travis's bike will be. Heavy, yes, top heavy, IMHO
, again, not much more than a 175lbs + passenger