I believe this is just south of Montgomery, there is a Flying J. No, not suggesting you stay there.
However, cross the I way is a newer campground Montgomery South RV, exit 158. We have stayed there a couple of times. I don't remember a lot of particulars, but, we survived just fine. Pretty much an easy in and easy out, lot of pull throughs, full hookups the way I remember. AllStays app on the iPad says it is a PA park.
All that said, it is NOT along 231, so scratch it. Sorry. Seems to be 2 campgrounds at Troy tho.
Finding a campground is a challenge, but, getting thru Birmingham on I 65 thru the dead center of town is the real challenge. Be careful, HORRIBLE road, we were below 45 and the chucking was still akin to that on I 10 in years past. I think we will go around next time, if I can remember.