Key word "hopefully". So many stories recently of people being denied entry in this scenario. Immigration is cracking down on 'tourists' who are spending too much time. Probably best to get a visa or use a fast track service.
"you just drive into Mexico and stay anywhere for anytime" Surely you can't be that naive. But because you probably are, just go ahead and do that. Thailand is doing fine without you
Doubt you will be able to just keep coming and going on 60 day entries as this shows a "pattern" that you are living here and not a tourist. Many stories recently of people being denied entry as immigration is cracking down. I don't know the details on the multi-entry tourist visa, but I'm sure someone here can fill you in.