I have an F150 3.5 EcoBoost Fx4 w/Max tow package. The specs are 11,000# tow capacity and 850# hitch weight. I always figure half of that for the real world.
I'm pulling a Grand Design MKE which has a dry weight of 5000# and a hitch weight of 525. It pulls it good, however the gas mileage is not great (8MPG). The MLE has similar specs but we liked the layout of the MKE better b/c it has much more counterspace. We were skeptical about the Murphy bed but love it. Same with the lack of a dining table, but we don't miss that either. We eat outside whenever we can, and when to do eat inside we use a couple chairs. All in all, I think it's a perfect couples trailer. Due to the shorter length, we can also get into areas of some parks you can't with a longer RV.
I've never weighed it loaded but I would guess probably 5500 & 600-650 on the hitch weight. I am not totally convinced the weight distribution hitch makes much difference.
I wouldn't want to pull anything longer or heavier that what we've got. A lot depends on balance.
I am considering a sway bar to the rear truck axle and probably air bags just for the ride factor.
Hope this helps you decide on a good match for your truck.