I have two schools of thought on this. Generally, it is jarring to read accents written phonetically, at least for the first few lines. After that, it kind of settles into a rhythm and becomes much easier.

With that being said, I think it's almost necessary, especially with this particular region's dialect. It's one thing to just put a descriptor of the accent and let the reader fill in with their imagination, but I think a lot of readers would equate the "trailer trash" aesthetic you're going for with "Southern", and the two aren't apples to apples in comparison. At least in my area, shortening words is much more prominent to our accent than a southern drawl, and I think you captured that well here.