Hello. Congrats on the new coach!
It should automatically dump the bags first, then deploy the jacks when you press auto level.
Did you try to manually dump the suspension and then auto level or manually level?
Depending on the terrain, sometimes even our front wheels are off the ground and the steps will be high (and thats WITH the bags having dumped air). If the ground is not level, that's just the way it goes...but as I said that's even with the bags dumped.
As far as the cable hookup, we hardly ever use it. However, I'm pretty sure though in our LA, it's in the electric bay on the left wall (we use sat tv almost always, but I'm pretty sure thats where ours is). Doesn't mean thats where it will be in your DS, but just trying to help.
Good luck and congrats again on the coach! Many happy miles to you!