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The thought of a Montana loaded to the maximum and in a lot of cases over the maximum, plus the weight of the TV careening down the highway at 80 mph sends shivers up my back. The trailer weighs close to 16,000 lbs, the truck will likely weigh in at around 8000 lbs. Imagine trying to stop 24,000 lbs with the brake capacity on these units in a reasonable distance should something happen, and you might get the picture I am seeing.
These units are “not” meant to be pulled at 80 mph, whatever happens to your tires at that speed would garner no sympathy from me or most other sensible people.
I must be just plain dumb because I cannot see how you gain an advantage on a 7000 lb axle by replacing a ST tire rated for 65 mph and 3460 lbs with a LT tire rated for 110 mph and only 3042 lbs. All you have done is reduce the carrying capacity by 800 lbs, you might as well have 6000 lb axles. I don’t care what the speed rating is, when a tire hits a pot hole at 65 it could very well do significant damage to the tire, if you hit the same pot hole at 80 the damage would be considerably exaggerated.
My suggestion is, if you can’t get where you are going at the rated speed limit of 75 mph on a G614, then why not buy airplane tires, then you could actually take off and land the Monty in excess of 100 mph.
Recognizing the weight limitations, maintaining proper tire pressures and keeping your tires within those boundaries while allowing for some safety margin, will provide you with a lot more success no matter what tire you are using. JMHO
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