A 1/2" increase in tire height places all of the coach and it's contents higher from the road surface, which is less stable and only helpful if ground clearance is required by your travel (off road, ruts, chuck holes, approach angle).
Another issue with increasing the tire size is that brake power decreases. The lever arm is more, so the coach takes more force from the brakes to decrease speed.
The change in aspect ratio reduces the sidewall stiffness. Some tires are designed with additional strength in the sidewall as is the case with truck tires vs passenger car tires. That might be a consideration to talk over with a tire expert.
The value of a bigger tire is the weight capacity increase, that you have identified. That should improve reliability as well. My preferance would be wider and lower aspect, but there are often very few options.
Weight verification is not difficult on an axle to axle basis. A standard CAT scale has three pads, spaced to weigh the steer axle, drive axle and the trailer. Takes multiple passes to get weights on all RV axles. Getting left and right weights is more difficult. The standard CAT scale is usually gated to not allow an offset pass for one side weights. There are supposed to be services that have individual scales to weigh all wheel positions. Maybe someone has a contact they would share.
Research this question with the tire guys for better information, as I used to think wider tires gave you better traction on ice.
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