On my last fiver, I replaced my Blowmax 15" Ds with Maxxis 15 Es. I only used them for 1 season before trading in but can say that the two tires aren't even in the same ballpark as far as quality goes. I swear the Maxxis tire side by side weighed about 10 lbs more and the sidewall was about twice as thick. There was a noticeable improvement in ride and I has total confidence when rolling down the road. I ran them at 80 psi. My stock Keystone aluminum wheels were rated for 2830 lbs (same as Maxxis).
Steve