I have the exact same tug/trailer/WDH combo. I leave the WDH bars home on short trips but like the feel that the WDH / anti-sway provides on the interstate so I'd use the WDH on such a long trip.
I have the same problem with the e2 'L' brackets getting cocked when hitting sharp turn with incline. Others have mentioned this. I just swear, readjust and keep going. No problems with e2 on relatively shallow turns and inclines.
Do what you can, with what you have, where you are.