Engue M20 as a mobility scooter replacement with upgraded seat and shock. 

living in the middle of nowhere and having very limited mobility
for years i used a mobility scooter to walk the dog..
and everytime i would be laid up in pain for days afterwards,
early last year i spotted the M20 did my research
1st thing was the seat apart from being rock hard it was way to low and even at 5ft9" it was like peddling a kids bike!
found a link on amazon for the new seat.. once it arrived i placed it and thought its to low and ill wack my knackers if i hit anything.. so as shown in the picture i fitted it backwards.. this raised the seat and gave the perfect position (not sloping down)
i then swapped the rear shock for a longer fully adjustable gas shock..
just these to things transformed it to the point it is a joy to ride it just floats over everything with ease..
it changed my life i am now able to get 5 or 10 miles in comfort daily walking the dog..
my only gripe are the noisy brakes.. i kinda fixed the front fitted a cable pulled hydraulic caliper not perfect but good enough for my needs.
oh and the cheap tin mudguards make a right racket..
again jumped on amazon and got a plastic set. (yet to be fitted)
its now perfect and is used daily..