11000 gvw will be the first issue that you come up against...I was concerned about my Bighorn 3270 with my
2017 Ford F350 diesel...even that is close to the 11,000 gvw with a pin weight at 2800 lbs. and two occupants.
I was very careful to lose as much excess baggage as possible. BUT, in real world towing, that pin weight doesn't even squat the truck to the helper springs or the Timbren springs. I just towed 8000 miles through the Rockies and it was effortless for the truck. I make every attempt to be at or under gvw rating, knowing that I will then be well within all other ratings.
Funny, but when you look at the tow ratings for my truck, they are significantly more than the 11000 gvw could possibly allow, specifically regarding cargo weight, which for my configuration is about 4600 lbs. Way more than the 3460 on my door sticker. Now, I know that my Laredo package did not add 1200 lbs.
I have to say that I don't think that 11000 gvw cargo number is a real world limiting number. I think it is a real world taxation and registration number, and likely a number that is intended to cut down on warranty claims driven by hard use and heavy hauling. Others will disagree.
Your rear axle and tire ratings are likely the real determining factor for you. Need more info, but I suspect towing that Landmark isn't a great idea. Fifty miles to a campground may be one thing, but extended towing is another. Having said that...I sure see plenty of folks doing it.
You can only make an educated decision if you weigh your combo. Overloads are dangerous.