One consideration is:
What are you pulling it with?
Really there are only a couple ways to hit Vancouver from Banff.
Hwy1 west to Kamloops and then the Coquihalla (Hwy 5) to Hope and then on into Vancouver. Or Hwy 1 from Kamloops - the Fraser Canyon.
Other option is to hit Hwy 97 south off Hwy 1 at Sicamous and go down through the Okanogan and take the Crowsnest (Hwy3) via the Hope Princeton Hwy.
Breaking it down, Hwy 1 to Kamloops - 2 choices, the Fraser Canyon or the Coke (Coquihalla Hwy 5)
The Fraser Canyon has less grades and they are not as steep. But the road has a lot of twisty corners where you have to slow down a lot. And there are many 2 lane sections.
The Coke is 4 lane all the way but there are some serious grades to consider.
With a 36' 5'ver, I hope you have a strong TV.
What are you towing it with?
If you do, I wouldn't sweat it and I would take the Coke. There are no winding corners to slow down for and it is virtually all speed limit driving with very few places you need to back off for. Long haul up out of Kamloops and another long haul up out of Merritt. If you drop a couple gears and accept the fact you are going up the grades at a respectable but slower than speed limit pace, then all is well and I would do this.
The Fraser canyon won't have you down a couple gears as much but you will be slower for all the winding corners, especially south of Ashcroft for a long ways.
Speaking for myself, I prefer the Coke over the Fraser Canyon (Hwy 1) just to avoid the switchbacks and windy road. I don't like my TT being constantly whipped back and forth, back and forth for many miles.
Now the other option, heading south on Hwy 97A from Sicamous, is really a much more picturesque drive than the Coke. Coke is a bit boring, not a lot to see unless you like high mountains and such. 97C has a lot of 2 lane roads as you head down through the Okanogan and take the Hope Princeton to the coast.
But for scenery, places to stop and things to see, this is a nice choice. There are many lakes to go by and enjoy. Mara Lake is spectacular, and there are a number of pull outs to stop at for a rest break. Very enjoyable.
Then you go south through Enderby, Armstrong and into Vernon. Vernon is a nice place. Stop at a place called Kelly O'Bryans for lunch and order a batch of Patchos! Yum Yum Yum ! I go out of my way to stop there!
Vernon south through Kelowna and then to Penticton. (I graduated high school there, got married there, made a couple daughters there!) And then you head west to Princeton, and then the Crowsnest Pass to Hope. This road does have a lot od twisty corners to slow way down for but IMO, this is the nicest drive of all. I love this section of highway, even though it has a lot of corners. If you are not in a hurry and you are willing to obey all the signs to slow to xx speed, then I would take this route.
Be sure to stop at Manning Park and enjoy the area. They have a nice restaurant there and the usual tourist store and such. Wander around outside and see the squirrels and gophers and such. They are friendly and will eat out of your hand.
Lots of government campsites along the way. Many of them border on the Similkameen River. You can overnight in any of these places for cheap.
I drag my TT over this route many many times. I have driven them all countless times and have to say that my first choice for enjoyment is the Crowsnest Pass - Sicamous south through the Okanogan. But it is a slower go with many towns and traffic lights along the way. If you have time, then this is the route for you.
If you are destination minded and want to get there and get there now, then go to Kamloops and take the Coke.
Hwy 1 Fraser Canyon would be my last choice. Nice drive, yes but the others have their inherent benefits over this road.
Whichever one you choose, the roads are all good, towing a big 5'ver is no problem at all and you will have a good comfortable drive. There are no problem areas where towing would be an issue.\
Whatever you choose, have a great journey!
FWIW, I am heading to Calgary in a week or so towing my 27' TT. I am going the Coke to Kamloops and then Hwy 1 on out to Alberta.
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