The Scarp 2 is a great choice if you want to make it free standing in future all you need to do is buy an extra set of poles. I bought a Scarp 1 whilst in the US a few months ago for a very reasonable £210 being a sort of grey/silver colour in the unlikely event of hot sun it is a bit cooler that a dark green tent and if being discreet is required might be mistaken for a boulder!

As I grew up just across Vancouver Island on the Olympic Peninsula, I can attest the weather will usually be the best in July & August. However, you can expect mosquitoes that time of year and, most probably, some rain and wind. Its green there for a reason! So a decent amount of mesh for ventilation and insect protection is a must. Its a rugged trail and terrain, a ground sheet to protect the tent floor will be necessary. Indeed, the only time I don't use a ground sheet is in Scotland (no big pine cones there). I love my Seedhouse SL2 Big Agnes Tent, although it is a 2 person tent that I use as a solo. Their vestibule sizes seem on the skimpy size but I still manage to store boots/gaiters & to cook in it in inclement weather. I will be coming over from the US for the challenge, you might even be able to talk me into bringing one over for you to save some ££ - contact me offline. They do have a Fly Creek UL3 available for 40% off that has been used as a demo, see the Specials area of their website.