I used to do deliveries with my E-250 ext. I had Transforce HT's on alloy wheels and Blizzak's on steel wheels for winter. That was the best summer/winter combo. Lasted me 6 years until the van was all done at 256K miles. All eight still had tread. Got $240 for the Blizzaks, $300 for the HT's and put worn out mismatched tires on to sell for scrap. If It had 4X4, it would have been 4 Dueler AT Revo 2's. Keys to long tire life- Alignment every year. Rotate every other oil change(every with synthetic) fix worn tie rod ends, ball joints, shocks, etc, ASAP. Check tire pressures every fill up.