I have been to Mew Lake 100 times and unless that windy road from hwy 60 is well maintained, I could not imagine taking a TT down there. Not to mention in Feb it being to cold to keep the TT warm, the furnace would not shut off. Not to mention not being able to use the TT plumbing. Would not have to worry about the temp of the lake to go swimming or canoeing, would have to cut through the ice first. I doubt you would need reservations in Feb...just to make sure there was a park warden to let you in.
2009 F150 XLT crewcab 5.4L and 3.73
2010 Flagstaff 27 BHSS