When you say two 7.4 batteries will START your truck "no problem", are you saying they will start your truck ALONE, or are you just using them to give your regular battery a quick boost? Because those two small batteries would have to produce some 400 cold cranking amps of power during the time you are cranking your engine.
It'll start the truck alone. I know, I was surprised too.
As far as the tongue box, I can't believe it weighs 46 pounds. I have one and I swear it didn't seem that heavy, but I'm sure the specs are close.
A well regulated militia, being necessary to the security of a free state, the right of the people to keep and bear arms shall not be infringed.