Hey, advice for you.
I live in New hampshire. They coat the roads in salt & sand every winter. I noticed you live in WI, I would guess they do the same up there.
It's about the frame. If the frame wasn't rotten on my 97 I'd probably still be driving it.
There are big holes right next to yuor rear tires, like 2" holes so the factory could get a socket in there and bolt the frame to the body.
The problem is that sand and junk get kicked up by your rear tires.
The frame then bends down hill toward the rear of the body.
That's where the sand & dirt & salt will sit and hold moisture and rot that frame from the in side out.
If I ever had it to do over again, this is what I would do.
Right near the back of the frame, on the bottom, I would drill a hole. At least 1" diameter.
Big enough to stick a finger in so you could feel around and tell if thre's sand in there.
Then everey now and then I would stick a hose in the hole next to the tire and crank it.
That would flush any debris in the frame out the newly drilled hole.
This is no joke, I would do this in a heart beat if I had it to do over again.
Just my advice.