As well mentioned, you just cannot predict road conditions for 2019, even with a crystal ball in the far north - especially on those two routes !!!!!
One thing I can predict for certain : The east Campbell Hwy. portion between Canol Road to Watson Lake will have intermittent rough surfaces, ruts, and perhaps hit or miss impassible portions due to potential extreme rainfall events...The west side wasn't so bad when I travelled on it in 2008 as I turned around 3 miles or so past Canol road junction (from west to east) and headed back to Carmacks....
A trucker in Liard Hot Springs told me I was lucky I didn't proceed as another trucker he knew got stuck on the east Campbell and had to get an excavator to pull the semi out of where it had gotten stuck.
Based on my one time experience witnessing the east Campbell, I would not attempt to pass thru there with at least a 4wd rig, and certainly not in a motorhome unless they pave it all.
If Sue were to repost her 2008 east Campbell Hwy. pictures when she travelled thru there, the OP would might want to reconsider that route for sure.
The Taylor Hwy. (to Jack Wade Jct. at mile 96 I can account for) has gotten a bit better since the major 2010 washouts took place, as they re-engineered parts of the roadway and well, some of it is the same so and so but is travel some in almost every type of rig - just take one's time on the rougher surfaces and all will be fine on the Taylor...The linking 14 mile Boundary Spur Road is now completely paved for the first time in 2014 leading to the border station and that has been a blessing the last two times I driven to the Canadian Border there.