I would strongly suggest reading the reading the ride rules for Saddle Sore 1000 at
http://www.ironbutt.com/ridecerts/getdocument.cfm?DocID=1 before embarking on the adventure. Although it's entirely possible to do on a scooter...if you've not done a Saddle Sore before starting out on this mount could be extremely challenging. Also, the Archive of Wisdom on LD riding at
http://www.ironbutt.com/tech/aow.cfm.
Since you talk about donations on the basis of "per mile"....I'd be concerned you're not quite getting the minimum of a Saddle Sore. If you're going to do a ride under the auspices of the Iron Butt Association that this thread area is related.....I would suggest you ask "per mile as long as it's over a thousand and you succeed in the ride". Otherwise, it wouldn't be an Iron Butt ride.
If a true Saddle Sore, drop me a PM and I'd be willing to donate.