Nah, not too heavy. They only get heavy if you lean too far over...*crunch*
As for height...just slide your bum off to the left of the seat when you come to a stop and stick ya left leg out...easy. Not that I have a problem in that dept, being 5'12"...
Oh, and the ER would fly with such a little person on it...would be a good thing. Go get one!