heavier trailer tires and fuel economy

Yes, I do have my trailer tires balanced. And those tires at that pressure are not going to give at all. They may as well be solid, with so little weight on it. But why put them on there at all? And then you feel that doing more to alleviate the rough ride by putting on shocks? Why not put the proper sized tires on to begin with and forego the whole thing?

And speaking of fuel economy and RV's in the same sentence is ludicrous.