EydieG,
I don't know if you've purchased a smaller truck or not for towing but, we too are looking. What I've found out in the last few days can make any ones head spin as far as what can or cannot be towed with all four wheels down.
First, the Ford Ranger, a very popular smaller truck, is towed by many folks here. But, some homework MUST BE DONE prior to you even purchasing a potential Ranger. One thing right off the bat, in every one of the Dinghy Towing Guides, ( I have all from '04 to '13) any Ford Ranger, be it 4x4 manual, 4x4 Automatic or 4x2 manual, cannot be towed OVER 55 MILES PER HOUR! Now, that's according to the guides. Just how many folks abide by that rule, who knows? What kind of consequences are you facing if you go over that limit?
I know, I know, This P.I.T.A. state of CA has a 55 mph speed limit if towing anyway but, just about every other state has a higher one.
Now, here's the hard part. If, you pick a Ford Ranger 4x4 automatic, they come with different transfer cases in different model years. And, a very large percentage of them use ELECTONICALLY shifted transfer cases and, have NO NEUTRAL in them from the factory. But, as has been stated, there are options. One is to acquire the "NEUTRAL TOW KIT" AKA. "NTK", that can be installed by the dealer and, then some of the electronics in the truck has to be "reprogrammed" so the transfer case will in fact go into a neutral for towing purposes.
The 4x4 manual versions have no need for such a device and, no need for any "reprogramming" of any electronics. The 4x2 versions are towable also but, only in the manual version. I'm not a fan of the gizmos of drive shaft disconnects etc. But that's just me.
And, there is no way in he.. that I'm going to get under my truck, at night, in the day time, ANYTIME, after a days drive, before departure from home or a campground, and could be tying up a narrow road in a campground, AND UNDO ANY DRIVE SHAFTS!!! IT AIN'T HAPPENING! There are far too many choices out there for toads, in trucks, cars, SUVs, and more, for me to have to get under it, in ugly conditions, and wrench a drive shaft on or off.
I also don't drive any higher than 60-62 anyway but, the 55 mph for the Ranger towing may put the kabosh on purchasing one of those for our purpose.
The F-150, 4x4 automatic, all the way through '11 IS NOT TOWABLE AT ALL, at least according to any and all research I've done so far. I don't know about the F-150 4x4 manual as, a manual model of that truck is probably as rare as "Kryptonite". The F-150 4x4 Automatic for 2012 and newer IS FLAT TOWABLE, RIGHT FROM THE FACTORY!
I had to do a lot of learning in the last few days but, I've found out that almost all GM pickups, as in at least the 1500 4x4 Automatic are flat towable, even with the electronic shift transfer cases. I just had to learn how to set them up for towing. It appears most of the Dodges are too.
But, in all reality, check the Dinghy towing Guide and if possible, the owners manual, for the year of model that you're considering. I've actually found many owners manuals on line for intended trucks we were looking at and looked up instructions for RV towing.
Research my friends, research.
Scott