It isn't JUST about SNOW. Nor just where you can Push/Pull your TT/5er.
Unless you only live a KOA Life, you WILL have occasions where you and your TV (if not also your TT) will be on a less-than-Paved Road in Less-than-Ideal Conditions during or after a Good Rain/Thunderstorm/Light Snow. Driving in a Front-heavy High-powered Large-Tire Vehicle is Less-than-Ideal in those Conditions, and the 5-10% Grade or Muddy Ruts or Sand/Silt/Clay will be Much more Difficult to Get Through than if you can get that Power and Control to the Road Surface through All-4-Corners.
I learned the Value of a 4x4 System during the Test Drive of my 1st 2WD Pickup, when the Salesman suggested that I pull into an "Unimproved Lot" as a Turn-Around after one of the regular AZ Summer Monsoon Thundershowers. After waiting 2+ Hrs for the Dealer's Tow Truck to yank us out of 2in of Muddy Silt/Clay, I went across the Street to a different Dealer whose Salesman was less Proud of his 2WD Trucks. And bought a 4x4 Dakota the next Day.
Pup: '11 HW-296
TV: '09 RAM 1500 Hemi 4x4 CC