We have almost the same truck as you and are happy with the ride and handling.
We got our truck with 78,000 on it and replaced the worn out OEM shocks with Monroe Gas Magnums,They were a big improvement over the worn out shocks and we put on a set of Cooper discoverer S-Ts and I made some blocks to engage the overload springs sooner.
When the tires got about 6 years old we replaced them with Cooper Discoverer AT/3. The ride improved, same air pressure but the new tires must have a stiffer sidewall.
We now have 130,000 on the truck and the ride and handling is still good.
Have you weighed your truck and camper? Maybe it's heavier than you think.
Love your toad.