that hub motor is for a mountainboard (i don't know who sells that)
here's a 10" geared trikke motor.
http://endless-sphere.com/forums/viewto ... ke#p744992
there are other 10", 12", and 16" hub motor
google search and u will see them.
there is a member that sells a 4wd moutainboard,
for $3K i believe...
http://endless-sphere.com/forums/viewto ... 35&t=30925
i said before, i never tried a dirtsurfer.
but as a long time skater, a dirtsurfer looks more dangerous than a longboard or moutainboard.
(actually anything with strap binding makes me nervous)
a longboard is not for everyone, if u never skateboard and picking it up at an older age, it might be a bad idea.
depends a lot on ur fitness and coordination.
and you will fall and take a slam, especially as a beginner, its part of skateboarding.