The latest generation PW seems to handle heavy towing (up to 15,000 pounds) without any significant issues. If I run into any challenges, it's always when I'm off road on softer ground. And 15k pounds is probably the upper limit. Even with over 400Hp, it's hard to accelerate off of lights as fast as the rest of traffic if you're pulling 15k pounds or more. Here's a picture of a heavier overloaded 16k trailer load that I drove across the county.
When I dumped this load, it actually picked up the rear end of the truck and slid it over 2 feet.
With my stock suspension, the loaded trailer actually lifts my front end up close to two inches and drops the rear end more than four or five inches. For your toy hauler, a weight distributing hitch would probably keep you leveled out nicely. Add airbags if you really need to. They may impact the soft cushy ride that we enjoy in our latest gen PW's when we are unloaded.
Be sure to air the tires all the way up and keep the stock tire diameter to maximize towing capability! Setting the brake gain correctly is key to safe stopping with heavy trailers.
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