Hi, welcome to 2CarPros.
It sounds like you may have some major issues going on here.
First, if you ruined a new set of tires in the rear of the car in a month and a half then I would speculate that you have a bent axle. The rear alignment can not be adjusted so you will probably ruin another set of tires in a month.
If the axle is bent then you may have some other things bent as well, such as control arms etc. If the suspension is bent as well then it may not function correctly and give you a stiff ride.
I would get under it and look down the axle to make sure its straight in both directions and look at the suspension parts left to right and make sure they all look the same. If one side has crooked parts and the other doesn't you know they are bent.
Let me know what you find. You can even upload some pictures of it.
Rich
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Tuesday, October 8th, 2019 AT 8:23 PM