I never thought about loading the bike on its own power and was not sure of that is a good idea.
One thing is, the bike handles are 44" off the ground
The hauler itself is 25" off the ground
So that is a total of 44+25=69" off the ground, for the bike handles.
And i have the ramp, that is 72" long to help the bike load.
I am 6'2" = 74" so the bike handles are literally at the eye level.
Also this BMW bike is 450lbs but in future i might go for heavier BMW adventure bikes that weighs 650lbs
I cannot imagine loading a 450lb bike at my eye level on its own power. 
That is why i was thinking a winch or something that i could possibly weld on the other end of the loader
Do people load heavy bikes in gear (no throttle)?
Looks like i might need a ramp for myself to walk up along side the bike.
If so, what kind of ramp could i look for that i can fold and store away at the basement of the MH?
thanks
jim