I love to ride the Monorails - and if you have ever seen anyone load a wheelchair or
ECV on or off a boat at WDW, it's pretty much the same!
Once you are at the station, A friendly CM will be glad to let you know the best place to wait. Once the Monorail arrives, and has emptied, they will place a ramp for you to drive on to the Monorail. Anyone traveling with you boards the same coach. At your stop, let a CM know that you want to disembark, and the ramp will appear again (you don't have to "Evil Kneviel" it off the Monorail LOL) and away you go!
My personal
scooter can actually do a 3 point turn inside the coach if we need to leave the same side we came in on, because of it's design. If your scooter can't do that, you will need to back the ECV off the Monorail. CM's are not supposed to help you with this - but you can always put it in "neutral" and push it backwards down the ramp if need be.
There are some of the Monorail stations that have SUPER steep ramps to get up to/down from the loading platform. Go slowly, and keep your center of gravity low, and forward when going up - and low and shifted back a bit going down. Some Monorail stations do have elevators, but some do not.
Have fun!