Consider this. Especially the GAWR of our rear axle relative to the 1/2 ton options you're considering (which generally are lower!)
View attachment 1681122
I personally think you're an airbag setup away from sitting pretty.
BTW, my travel trailer is very similar in weight to yours. I've done many different long trips now over just about every type of wind/hills/mountains. I'm completely happy with my setup and I do not want for a better tow vehicle. Especially when this one has so much luxury, off-road capability, seating, etc. Only thing I'm looking for is more range which I'll get to eventually with a aux tank.