I put as much weight back on the front to restore to original as I can. And with my WD hitch and both trailers I owned thats tilting the head back with max washerers installed and chain to 9th link on mine from the bars.
All WD are different but with that much weight I would tilt the head as far as you can...
what WD hitch you have?
see towing planner here.
http://towingplanner.com/ActualWeights/TravelTrailerCatScales/?w1sa=2920&w1da=3640&w1ta=5640&w2sa=2680&w2da=3960&w2ta=5540&w3sa=3120&w3da=2520