What is the max weight you CAN tow?
This is the lower of:
The hitch rating
The GCVWR minus the coach's loaded weight (assuming the loaded weight is less than the GVWR).
Start from there, use a fraction of that amount (wherever you feel comfortable, some use 80%, others 90%, others 100%) and find a toad which weighs less than that number.
For example, if you determine you can tow 5000 lbs limited by hitch rating and you went the 80% route you would be looking for a toad weighing less than 4000 lbs.
If you have an 8000 lb hitch and your GCWR-GVWR (or actual weight) supports it you may find you actually CAN town that 3/4 ton pickup.
Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad
2020 Chevy Colorado Z71 Trail Runner Alternate Toad