When I had my 210WBS, I weighed in right around 6,000 lbs loaded for 3 months on the road. If you don't pack as much (go for shorter trips), then 5500 to 5800 would be a realistic number for that trailer. In theory, you could wind up with a tongue weight of better than 780 lbs without even trying hard. Mine routinely weighed in at 795 to 825 lbs (I have a Sherline scale).
My recommendation would be to go to a heavier weight distribution hitch with commensurately heavier bars; in the 1,000 lb category. I'm partial to the Equal-i-zer brand hitch, however, there are other hitches out there that do an equally fine job. I liked the Equal-i-zer for the ease of hooking up and unhitching and I don't like the chained bars of some of the "other" brands. I know of a person that actually broke their foot disconnecting their "chained" system by standing with their foot under the bar...not the brightest thing, but, going for maximum "leverage" results in standing closer to the unit than prudent. The Equal-i-zer uses a different "L" bracket type mounting system. I towed that trailer with a 2008 Jeep Hemi Commander with the Equal-i-zer and 1K bars and it was a sweet tow and no issue of whether I was ever "over" the rating of the hitch.
Not that this has anything to do with your original question, but, in the realm of hitches (bars of any type for sway control), I heartily recommend a power tongue jack if you don't already have one. The convenience of being able to easily lift the tongue and the tow vehicle's rear end to make the attachment of the bars easier can't be overstated for such a small investment.