Our beater van needs 2 new tires up front. There are 2 TripleTreds upfront and 2 Hydroedges up back. The Hydroedges are shot due to bad front alignment, but the noise wasn't there until I put them in the back. I know Costco won't warranty them due to alignment issues as I can feel the tread is "wavy". Is it OK to mix a non-directional tire like a BFG Premier Touring or a General Altimax RT with the TripleTreds or no?