OP, sorry to hear about your mishap and hopefully no serious damage done.
I always step ON the hitch or ON the truck bumper and hold onto the electric jack head while stepping over. I have banged my shims and almost fallen too many times just trying to step over the hitch. I put one foot on the hitch or the bumper, grab the jack head, and swing the other foot over to the other side. Use extreme caution if either the hitch or bumper are wet from rain, don't ask me now I know that....
If the truck and TT are at an angle, sometimes you can't fit through and need to walk around.