I have towed my 5W in snow over Wolf Creek, not by choice. Unpredicted snow going E/B and 4" on the road by the time I hit the summit, 4X4 truck with shift on the fly. I grew up in WI and drove commercial in the 11 western states so plenty of snow. Many states require a drag chain as stated. Chains required means the roads **** already so you can lay in the snow getting the chains tight enough not to beat the tow vehicle to death, trailer will be worse with even less clearance.
Why would you tow in snow when you do not need to? Snows the best reason when RVing to stay right where you are, warm and dry until roads are clear.