2 wheel drive or 4 wheel drive

One thing to consider is the height. Depending on your hitch and tongue height of your trailer, the 4x4 may require you to raise the trailer to get the proper bed clearance. For example, I had to flip the axles on my trailer to get it to the proper height. Some trailers have adjustment in the shackles. Mine didn't. I live in SoCal and rarely leave the road. There was at least one time where my truck would have needed a tow to get out. I had to go up a loose gravel driveway in the June Lake area (trailer not attached). I couldn't get any traction at all until I put it in 4WD. Then it was like I was on pavement. As mentioned, 4LO is great when doing parking maneuvers. You don't have to rev as high in 4LO to get things moving which saves on the transmission too with less slippage (=heat)with low speed maneuvers.