The trouble with most diesel 3/4 ton trucks is they run out of weight carrying capacity before they run out of towing capacity. When you start looking at your ability to drop load onto the rear axle, like a fifth wheel does, having those extra springs and wheels and tires that the one ton gives you disappears fast.
A lot of what you want as far as quality build is available, but quality means weight and so you have to compare pound for pound compared to say an Arctic Fox, (known to be heavy, and quality).
So, what is your capacity on the rear wheels? What can you drop on there and still be OK with?
Mike
2012 Winnebago Impulse Silver 26QP
2005 16.6 Double Eagle
2018 Jeep Wrangler JK
previously Snowbird Campers,
Triple E Motorhome and Fifth Wheel