I recently bought a two-into-one exhaust out of a Pull-A-Part Suburban for my son's '94 RCLB. It was all just me getting in there and seeing what I had to do and what worked. If you don't like people telling you that you need to get in there and do it, then sell your truck and buy a Corolla.
The crossmember behind the transmission was riveted in place, keeping the exhaust from coming down. My son's truck did not have that crossmember. I cut the exhaust in two with a hacksaw to get it out of the Pull-A-Part truck, then used two pieces of angle iron to get it aligned back up for welding. I lined up the tubing seam with 1/16" gap, tacked it, checked it for straightness and cut one of the tacks to re-adjust it, then welded it back together.
My son and I jacked the transmission from the driver's side and removed the crossmember. The exhaust bolted up with a sufficient application of force and cargo straps, and we had to find places to drill holes and bolt in the Suburban hangars. It worked, but we also had to replace the exhaust donuts and a couple of exhaust studs while we were in there.