Man what a problem to have.;)
From what I see you have a huge amount of choices. I have a 29 ft Keystone Outback 298RE which is touted as 1/2 ton towable, (Barely). I pull it with an 08 GMC crew 5.3 v8 3.73 rear with heavy duty towing package. I added air bags and heavy duty Bilstein shocks. So far so good.
Look for a aluminum frame super light construction rig. my preference is for fiberglass and aluminum over Stick and tin. Keystone and Jayco are 2 good reputable manufacturers for a start.Fit and finish on todays rigs are really nice.
Good Luck on your choice, and have a long healthy happy retirement.
BB