The tendency for tires to follow cracks and lines in the road is called Tramlining. Wide tires are more prone to do this, so the 13.50 width is contributing. And Toyo MTs can tend to wander and have less precise highway handling than some other tires when they are new. Those tall soft tread lugs can be a bit squirmy. Drive them for 5000 to 10000 miles and the squirmy feeling goes away.
2017 Jeep Wrangler Rubicon Recon; 35s - no lift, Warn 9.5 XP-S, ARB Twin Air, SPOD
2017 Jeep Grand Cherokee Trailhawk (wife's Jeep)
2016 Ram Laramie 3500 Megacab 4x4; 6.7 CTD, Aisen, AEV Prospector conversion; 37s, 4.10s, Warn 16.5K