I would be interested in the price you paid for your rig and what the cost is for new tires and brakes and fuel as compared to your 1-ton truck.
Hard to spend more than $70,000 for any 3500 diesel pickup and the used Freightliner M2 trucks I have looked at all cost over $120,000. I agree about getting a Class 4 or 5 truck at a certain amount of tow load but that does not apply to 99% of the travel trailers being pulled on the highway.
80% of the 5th-wheel travel trailers I see being pulled down the highway are pulled by 2500/3500 trucks that are SRW and doing so with no problems.
