You are correct to remind responders that your tires are 14 inch and not 15 inch. Because the 14 inch tire is smaller, it has to spin faster in order to cover the same distance covered by a 15 inch. For a 14 inch tire, that going at higher turns means more friction heat than a 15 inch gets. Heat means more air pressure resulting in the tires. Too much air pressure can mean a blow-out.
Unfortunately, nothing is simple. I don't know where you will be trailering, but if it includes the Southern latitudes, road temperatures can sometimes fry you an egg during the peak summer months. That plus too much speed on a 14 inch can mean added risk of a blow-out. In southern FL, I often see RV's by the side of the road with flat tires in the Summer - might be true in your area too.
Additionally, the actual loaded weight of your trailer is important. The posted weight for your trailer probably does not include the weight of added accessories such as an awning, an AC unit, etc.. That plus all your "stuff" adds a lot of weight. The max rated speed for your particular tire is set for a max rated weight loaded on that tire. Too much weight at too high a speed is added risk of blow-out.
I have 14 inch tires on my TM. I set my cruise control at 57 mph, check my tire pressures in the morning frequently while on a trip, and try hard to stay as light as possible. Course, I take some chances, too. Sometimes, it just boils down to (a variation of) Dirty Harry's quote: "Do I feel lucky today, hunh, punk?"
Maximum towing speed
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