how close doesnt matter too much as long as you are way up high ...say 25 feet.Deer walk under tree stands.. No more than 25 yards. from the trail for me and on the ground .Im deadly from 25 yardsand less..chances are Ill see him before he sees me...Clear shooting lanes a must.

I don't think 10yds is too close, except for the steepness of the shot angle. I agree with others who have posted in this forum in the statement that wind direction is everything. If the wind isn't right (a crosswind is best), I don't care how good the tree looks, I won't use it, period.

In a situation like this it sounds like you have a lot of ground blind material laying around so go for it! When you prune your shooting lanes, just don't leave the slash laying around for the deer to find, use it withon your blind. Your chances of having a shot will be better from a blind if the wind isn't right with the only available tree. You don't need to buy one of those expensive popup blinds either.
Walmart sells blind fabric that is inexpensive and is very lightweight and easy to transport. I always have a few yeard of it in my pack just in case.
You'll want to wash and line dry it to get the factory smell out of it before you actually use it though.

If you do decide to use the tree, I would suggest setting your stand up on the back side of the tree so a deer that might happen to look up won't see your platform. You will have the tree as cover between you and the trail, but you'll have to stay on your feet more and be ready. You'll find you can lean against the tree while your waiting and it's not so bad. Good luck!

About 15 yards is the best I think.I always hang my stand on the opposite side of the trail.
The farher the way you are the better you can trim your shoooting lanes.If you have to be close to the trail,I wouldn't trim much, if at all.