I am presently using a 2002 Chev 2500 HD Duramax with several upgrades (tires, airbags, chip) to pull a 37' toy hauler. Is it ideal? No, but I cannot find a 3500 right now. Have one ordered but it is 12 to 14 weeks out. I have pulled about 5,000 miles with this setup with no problems, including a 2,000 mile round trip from NM to West Yellowstone over some pretty gnarly roads and mountain passes as well as considerable interstate. I do not get in a hurry (55 to 70 mph depending on conditions), I pay attention to my surroundings and road conditions, and have not encountered any white knuckle events. Prior to this I pulled a 1996 Holiday Rambler 32' 5th wheel all over the country with the same truck. I would guess that your 250 would be a better pick than what I have since you have a more modern truck and a lighter trailer. But, I am guessing you are going to be overloaded a bit. I watched a video recently where a 2020 Chev 2500 Duramax was tested on the Ike Gauntlet pulling 16,000#. Also watched one where a 2021 2500 was pulling off the bumper at 11,400# on the Gauntlet
towing brownsville tx. I am not saying any of this is right or advisable, just telling you what is happening in the real world.