[Huck]

Simply take the time to explain the facts to your wife as most women don't understand mechanical stuff. Show her the location of the gas tank in the cab, show her the filler neck pertruding out the drivers side as a kind of gas vapor wick in the case of an accident!! Then show her the many safety features of the truck like the deeply padded dash, the lack of dangerous air bags, etc. By the time you're done, you wouldn't have to worry about taking your daughter in the truck---or for that matter, your wife, dog, cat, or any other living thing!
Actually these trucks are not very safe for a child and I would be caucious as they really are a fire bomb waiting for an accident.!!!!!!

Up to XX lbs and XX inches, a child must be in a rear facing seat that can mount with a stock lap belt. Over that size, you can use a front facing seat but most have a top clasp the secures the seat from flipping forward. You could probably clip the seat to the back of your bench seat but have no clue as to it's ability to handle an accident.