Originally Posted by justa dumb hick

My only thoughts are: sway bars and shocks.
If you’re over 50, then you already understand the limitations of drum brakes, and I’m guess the C30’s have big ones.
I’m also assuming the rear springs have been selected to match the trailer load? I don’t see why it wouldn’t work. You may have a few teething problems to resolve initially, but these old trucks were built and designed to work hard...which they did uncomplainingly for many years. Keep us in the loop and let us know how it works out.