John,
Those trailer tires are smaller than your car tires and they go around a whole lot faster, more contact with the road, more friction, more heat. I'd be careful and keep your speed down, especially on a hot day or you'll melt those suckers. I always go a little slower on a hot summer day and stop to check the bearings and the tires.

And make sure you lug wrench fits the lugs on your trailer, sometimes they are different.

100mph? Come on, you lose a tire at that speed and all that will be left of your boat will be splinters. It'll probably fly off into the oncoming traffic and cause a pile up. Do you really want to be the guy they show on the news in the back of the police car surrounded by wreaked cars?

100 in a car with good tires and good suspension is one thing, but towing your trailer? Come on think about it.

I was towing my utility trailer and it wasnt tongue heavy enough, and I got going to fast down a hill and it started fishtailing and jerking the back end of my car back and forth, it scared the Sh*t out of me.