Parts starting to brake.

[Pont406]

My truck had about 91k miles when I bought it. I did a motor swap and fixed a couple other problems. I put 260 miles on it now. They were a hard miles. Taking off hard from the light, downshifting, basicly I was having fun with it. Tonight after some driving I smelled a burning rubber and I heard a whining noise, almost the same as rear end whine. I found a broken center support bearing. Prior to that I started to get a loud rattle from the back. Tailgate support broke.
I never had a vehicle with the center support bearing. If I replace it how long will a new one last? What is a good fix for that, maybe one driveshaft instead of two? Any way to fix a tailgate?
I am getting pissed with this now. All the parts were original but in working order, besides tired small block. Thanks