h49 is one of the only sites on the trail that can fit multiple tents (possibly upto 4). i pretty much stay at this site every year because some keener always get h48 before me (h48 is considered to be one of the best sites on the trail, proulx lake is very serene). i had one hiker stay will me on h49 one year because he underestimated the distance to h50. given the popularity of the trail and the time of year, i could see why they'd book a couple of parties on it.
i booked my sites one week after the 5 month maximum booking time. i wanted h21 on my second night (had to take h20), h37 on my fourth night (had to take h38) and h48 on my fith (had to take h49). if you really want you site you almost have to book on the day the 5months booking time frame come into effect. i was only off by 4 days and had to take 3 alternate sites. i happy about h7 though, topaz lake is beautiful and has great swimming.
my pack will come in with food and all to about 35 lbs. base weitght is about 20lbs. i'm travelling solo (well not exactly, my dog will be with me as per usual). my dog carries her own food.
h16 isn't that bad of a trek. if your on the trail by 9:30am, you should get there by about 4pm. there the usuall up and downs; the only real obstacle is a 1km uphill section between baie fin and three narrows (h7 and h8). it wide and used as a portage as well, but is steep. your second day will be easy, only about 3hrs max to get to h59.
h59 on your second day is right across from me. i probably won't see you the first day, but i'll drop by h59 (or feel free to come by h20) on the second night.
the valley your planning on go off trail is technically diffcult. the drop from h23 is one of the steepest pitches in the park and it's a hill/ridge covered in scree (go down one at a time or really close together to avoid knocking any rocks on your mates). you might find a spot in there, could be tricky though because once you go down, your pretty much going back up the ravine due north the other side along a quaint waterfall. there a few spots on the way where you could break out camp though (i had to one year when i went with a friend who thought they were in better shape than they were, mind you we were doing the trail in 5 days) check on your arrival day as sometimes there are cancellations. ideally from h59, you'd want h22,23 31, 32 to get over to 34 the next day. to go from h59 to h34 is possbile, but would be a good 10 hrs of hiking. and you'd be rushing through one of the best and challenging sections of the trail.
oh…and my buddy mentioned you can get cell phone reception in 4 or 5 of the higher outcrop areas (around h23 before decsending to moose pass is one).