Guys... I have BEEN THERE...
My last big bike was a 2007 Harley Road Glide... great balance, but when loaded.... (Me, Wife, clothes and camping equipment) 1,000 lbs...
I added an insta-trike kit from Tow-Pac.
http://towpacusa.com/product/instatrike/I bought mine off of ebay and drove six hours one way to pick it up.
Saved me 400 bucks still.....even after mileage for gas on my pickup
The smaller ones will run you in the low $3,000 range with shipping ect.....
You have to figure in what you will be paying for the new bike/scooter vrs. a trike kit.
I drove the Glide for about 2 years with the kit on it, but decided I really didn't want a bike I could not push backwards (It did not come with the reverse kit, which costs a bit).
So I went from a 3 wheeler back to a light two wheeler.... the savage...
My suggestion to you gents is to go three wheels with a kit that has reverse.... you know your bike and the mechanical issues it has or will have, a new one... well, its a learning curve all over again, plus maintenance costs if you have to take it in.
But you fella's know all that....
All I am saying is if you really don't want to go above $4k or can't afford it.... try a trike system. The steering is a bit different and you can't "lean into it", but a small bike with a trike, add reverse..... is what I will most likely do in the future.
Also i've been looking around and found this.... little more expensive but shows it can be used on the 650
http://www.voyagertrikes.net/will-it-fit-my-bike.htmlYet another, if you got some mechanical skills... only $1,500
http://www.ebay.com/itm/TRIKE-CONVERSION-KIT-/251011809285?hash=item3a7178400...And one of our older gents used the axle off one of these.... he bought the axle by itself and welded up his own frame/w reverse.
http://www.ebay.com/itm/Trike-Conversion-Kit-for-any-year-Harley-Davidson-Spo...Pic from the ebay, it is a belt drive...