You need to know what wieght you will literally be putting in the axle. If constantly over by a few hundred lbs, get a stronger capacity tire the next time around.
My funding with driving and loading trucks, going to a bigger size, or wieght rating, if I only need new load rated tires at a D 8 ply psi, the pricer E 10 ply rated tire does NOT carry the load any better. I'm better off saving my money.
If I go up in size, I can go down in ply load rating too. UNLESS I need addition load carrying capacity.
My experience is probably similar to Grit using light duty trucks in a construction use. Including running down the road at 150% of tire capacity. I should point out too, in usually on city county roads doing less than 50 mph for 5-10 Mike's, not freeway at 60 in 90f temps. Your mileage may vary in this. I'm also within legal axle loads in WA st which is 500 lbs per inch width of tire, along with a paid for gvw for loads I carry.
Marty