I would be more concerned with braking. Under a hard stop, the trailer is going to try to lift the rear wheels of the tow vehicle.
Electric trailer brakes will help or eliminate this.
I would go with a longer drop mount on a class 3 hitch.
Alternately look at putting blocks under the springs on the trailer.
I have experienced the lift problem running heavily loaded and it was bad.
The pop-up has electric brakes and the proportional controller just showed up today!
No good way to add a Class III hitch (see my discussion of such in orig. post), and no one makes a Class II ball mount with “enough” drop. (This may be because most Class II hitches could not take the “torsion” of a ball mount that drops, say, 8”, coupled to one of the many Class II weight trailers that do not come with brakes installed.) In THIS case, the hitch is PLENTY strong, why Ford welded in a Class 2 receiver may have something to do with trying to minimize the transmission problems they’re known for... But, if one goes to Ford’s literature, the only thing “preventing” a max towing weight of over 5000 lbs. is the Class II hitch!
Ooooo... That doesn't sound good!
On one forum, a guy raised the entire trailer (axle mount mod) to help with getting into certain locations. I've also seen wheel well mods and bigger tires. I don't think I'm quite that energetic (or moneyed) at this time...