Yep, cycled the KVR last year at the beginning of August. Was not impressed!
Trail was either washboard or churned up dirt from all the ATV's (who aren't supposed to be there btw) on it. Lots of arrogance from them too!
The route is extremely popular so in Summer it is busy. And not with cyclists as you may think: No, there are more 4x4's, atv's and motorcross bikes on the path all doing their bit to completely destroy the once (?) well graded trail; add knucklehead ambience and scare away any of the nature that once lived in these parts. Don't know exactly when you are planning to do the trip, but don't go anywhere close to BC Day.
We started in Hope (this first stretch is beautiful and reasonably quiet), but after a half day of riding on semi to good path, we were confronted with what I would basically term: MTB terrain. Even without a fully loaded bike, you'd have to carry your gear over some sections. So, if you are going to do it pack very light.
Also the trail is badly signposted and you find yourself back on the main highway several times (others that we met (both directions) had exactly the same problem). The main drag is nightmare riding and we were pushed off the road continually. I hated it!
We were planning to follow it all the way to Kelowna, but went as far as Penticton when we just plain stopped using the trail altogether and stuck to both minor and forest service roads which are in just a tad better condition.
Of course we were fully loaded back and front, which makes an incredible difference when pedalling through sand.
Two camping spots that were cool:
There's a small user-maintained camping further on from the main site at Coquihalla Lakes. (quieter and no ATV's and motorcross bikes)
Chain Lake Forest Services Campsite near Bankeir is a great spot to hangout.
PS: if you want to read the nitty gritty details, distances, altimetres etc of our trip then check out this link: http://www.tour.tk/on-the-road-0808-...canada-usa.htm
BUT...I don't write a pretty picture of the KRV nor bike touring in BC in general, so you are prior warned.
Personally: if I had my time over again, I'd stay on Vancouver Island and just amble my way around. The cycling is really challenging, there are a few gravel trails in much, much better condition than the KVR, amazingly beautiful beaches, rivers, tonnes of wonderful camping (free) opportunities and you can get off the beaten track and way, way, away from all the holiday-makers. Just my opinion :-)