seating bead on sand paddles

I just bought a set of 27-13-14 EFX Sand Slingers w/ 10" M23 Battle wheels and to my disappointment they shipped them dismounted. I’ve install tires several times and using a ratchet strap I’ve always got them to seat. No luck this time, fought with one for hours finally took them to Les Schwab where they struggled even using a Cheetah. Just wondering what the trick is, Im going to the dunes and if I break a bead want to be able to reset it. I’d prefer not to use
starting fluid, should I buy an Ebay Cheetah? Or will the tires stretch out and be easier next time?