Now for road conditions:
The route you have picked all the way up 395 to the Canadian Boarder is relatively flat until you get to Rock Creek.
From Rock Creek you will start climbing up and over towards Anarchist Mountain, from the summit you will start to descend down into Osoyoos. The hill down into Osoyoos, is a bearcat! When I take my 34ft 5er down that hill I sit in Second gear and use my breaks only to keep my speed in check ( below 35 mph) and I leave it there. I let the transmission do all the work. There will be a rest area with a picnic site on the Left hand side of the road as your going towards Osoyoos on Hwy 3. The long steep hill is not far past this point so when you start down take your time.
You can also take Hwy 33 to Kelowna where you can meet up with Hwy 97. This road is relatively flat unit you get to the Break Check point on which you will see on the right hand side of the Hwy about 2 miles past the Mccullough road jct with Hwy 33.
From the Break check I put my rig again in 2nd and only use my breaks to keep my speed in check. This hill is not as steep as Anarchist and not near as long, I usually will use this route because of the that hill going in Osoyoos.
Either one is doable I'm just giving you the heads up.
Enjoy your trip north
Soup.
2018 Northern Lite 8-11 EX Dry Bath
2017 Sierra SLE, 3500 HD / 4x4 / Duramax with a 6 speed Allison Trans
Torklift Super Hitch 20K, 48" Super Truss, front and rear frame mounted tie downs
Fast Gun Long Range SS Turnbuckles, Fast Gun locks