No tone intended, it’s just tough to write 1000 words explaining what those who aren’t well versed in heavy use of light duty trucks don’t understand.
Bottom line, the limiting factors for load carrying in virtually any/all srw HD pickup is OE spring capacity and/or OE rim rating. Tires are 3rd as it’s easy to get 4000lb rated LT tires.
If you’re already spending $60-100k for a truck and $15-50k for a camper what’s $500-1000 in suspension upgrades or a couple grand for higher rated 18” wheels or 19.5s if you’re not comfortable exceeding rim ratings?
You may want or need the suspension upgrades even if within the OE payload. Mostly due for the higher cog of a TC compared to, say, a 4000lb pallet of brick or a load of wet firewood in the bed.
Think about it this way. DRW trucks (which now have a bit stouter rear axles in the last few years but used to all run approx 10klb versions of the same axles as srws for years) have the same frame/chassis but have let’s say avg 6klb payload ratings. What’s the difference? Springs and 2 more tires. That’s it.
All without getting into the propensity for failure, or lack thereof, of OE srw rims at their ~3600lb ratings. Have abused and overloaded enough trucks/wheels over the last 35 years to have a great deal of confidence that a slightly overloaded OE rim will not fail, short of some serious extenuating circumstance type of loading (severe impact). But you’re already past that point since you’re comfortable maxxing out a srw without the added security of training wheels.
