Mom -
You are in even better shape than I thought. Your husband sounds more than sufficiently handy if he can do all that. Motivation is a different question - but you wouldn't be buying a trailer if he weren't motivated to keep it up, right? And if your Tacoma came with the factory-installed towing package, it should be sufficient.
The remaining questions are easy.
1. Does the Tacoma have a built-in brake controller as part of the towing package? By 2015 a lot of trucks have one, but you must confirm it. If it doesn't have one, you must buy and install one before you hook up the trailer. I suggest that a good brand is Tekonsha, not because it is best in the world (there are others just as good), but because lots of people have them and like them, and there is a lot of experience you can lean on. No matter what you choose, be sure it has the word "proportional" or "inertia" in the description.
2. Your Tacoma has a 7-way electrical connector as part of the towing package. Make sure that the 12 VDC power pin is energized. For unknown reasons, some truck manufacturers install the connector and hook it up perfectly, but leave the fuse that energizes it in a little bag in the glove compartment.
I'm referring to the pin marked "12V" in this diagram. It is probably energized only when the truck's ignition key is ON.
http://www.trailmanorowners.com/foru...&pictureid=442
Bill