skipnchar wrote:
80% range is useful for those not willing or able to do the REAL numbers but it appears you don't have that problem. Using 80% of capacity just allows you to do estimates instead of real numbers.
Yep. I would add that towing above 80% (generally speaking) requires specific care, including in most cases a properly adjusted weight distribution hitch (WDH), proportional brake controller, properly rated and inflated tires, and additional 'skill' by the operator.
In most vehicles when towing above 80%, you will certainly 'know' you are towing! You will be lugging up hills, have to tow at reduced speeds, have to pay special attention to road defects that cause significant bounce, etc.
Most vehicles towing below 80% are very forgiving for inexperienced at towing drivers.
IMHO, that is why you hear the 80% number quoted often. Keep in mind that MANY vehicles have TWO SEPARATE tow ratings- one without WDH and one with WDH. The difference? About 20% ;) Get the picture?
Interestingly, those who argue for or against the '80% rule' usually are the ones who know enough and have enough experience and proper equipment that the safety margin doesn't affect them. How's that for ironic? LOL.
Be sure you have the proper WDH and sway control and properly adjust your WDH. Many forget or don't know how to adjust their WDH. It makes a HUGE difference.
Hope this helps.