so in an effort to come to the experts and the people that have real world experience I'm asking the question. I have a 5200lb dry travel trailer and the truck is as follows. 1991 C2500 350tbi with Z82 package, dual battery, trans cooler, heavy rear leaf springs. 4l80E trans, with shift kit and 3:73 rears. Compression test on engine 140/150 and in between across the board, so within 10% variance. Everything that can be external on the engine has been replaced or serviced within the last 6 months. Complete tbi clean and all new everything except injectors as they are throwing cold cone pattern. Engine is strong, transmission serviced and pristine mechanic said. The truck is in good shape as it was very seldom driven and been family owned since new. 135000 miles / 217000km. I just want opinions as to if it will tow ok, should I adjust timing, or anything that maybe a good upgrade. Don't get me wrong if I can tow i will keep the 350, but a ls swap isn't out of the question for fall lol.