First time tower - multiple questions

My advice is to take all this advice with a large amount of skepticism. Here is an example of faulty advice, "tighten the chains and see if the rig is level. If not, adjust the number of chain links." Links are used to adjust the amount of weight distribution, not to level the trailer.

Not picking on anyone in particular, but we are not going to be chasing that thing down the road or replacing a transmission if you forgot to install a transmission cooler that is usually included in "Tow Packages". Keep asking questions and keep questioning Internet answers.