I really like the 2900 and 3100 models but like almost every brand class c out there, once it gets to 30 foot or beyond there’s weight issues. At least in most I’ve read about.
I agree with you.
In those "At Limit" or "Just Over Limit" conditions, the weakest link is always the tires. Most often a rear tire explodes, and when it does, it destroys the motor home. It happens up front too, but not as often and with less damage as long as you maintain control of the vehicle.
If I owned a 2910D, 2910T, or 3100, my first trip out would include getting the rig weighed at a truck stop weigh scale to determine the actual "trip-loaded" weight per axle on the tires. Tires per axle that are at or over the limit with 80 PSI in them, I would replace them with a set of extra load tires that increase the weight capability per tire by roughly 500 pounds. That translates to roughly 2000 pounds of extra load ability on the rear axle, and 1000 on the front axle.
There are two different extra load tires available. One with a max of 83 PSI to get the max load rating, the other at 90 PSI. I would get the 83 PSI since the stock Ford steel wheels have a max rating of 80 PSI. 3 PSI over is negligible.
One other topic rarely discussed is the tire gauge you use.
CLICK HERE to read my experience on tire gauge inaccuracies. The one tire gauge that was supposed to be my best, turned out to read 9 PSI high. That meant I was under-inflating my tires by 9 PSI, a condition ripe for a tire explosion.