Trying to find a good used Tandem Dump truck or wheeler as some might call them. Just looking for info as I am new to all of this. What type of suspension is best? 8LL transmissions or would a 13 speed be better? Double frame better? Obviously bigger motor is better, Found a bunch of 400 cats, any pros or cons to that? This isn't going to be truck that I will run forever, just something that I can get into and run a 20ton tag trailer behind to use for a couple of years and in the short term get my class A. Already have my permit. I know there is a truck and trailer section but seems like most over there just discuss smaller trucks.