I took my small boat to pool 4 this spring, 530 miles one way if I remember correctly. It is a 16′ boat that is pretty much basic with a 30 hp motor two batteries 40lb bow mount trilling motor not really a lot of weight. The trailer is 18′ and has 12″ tires, on the trip up I did not have any problems however when coming home I had one tire get low on air. I do not know how long it was low since it is so small it does not hold much air, I did check the tires every time I stopped for food, fuel and bath room. When I noticed it I stopped at the next station filled it and came home since I was only about 60 miles from home. The tire did not give me any issues all summmer but if I were to go on an extended trip again I would buy some new tires since these are 4 years old.
Two things I want to convey
1) Small tires don’t hold much air so when they get low on air it does not take long for them to heat up and blow.
2) Small tires spin faster so you will not get the mileage out of them that you would with a larger tire. Remember my boat trailer has 12″ tires not 8″ like the ones you are looking at.
Good luck with your choice fishhunter
Oh, I almost forgot to mention those Alumalite trailers are VERY nice.