I put up a 12x20 shelter logic 2 years ago on my remote property to cover some impliments. It collapsed this past winter during one of our heavy snows. If you can get out to it to knock snow off during storms, I think you should be able to get 3 years out of it w/out a problem. If you cannot get to it, you'll risk the same fate as mine.
I hear you on the snow there Birdmayon - wonder if we'll see the same mess again this year. I had a serious workout trying to get the snow off the "shed"
Lt Cheng - on my third year - SL 12x24x8 - and it is still in great shape. We got hit with lots of heavy snow last year - but mine fared much better than Birdmayon - pretty much unscathed. I did not stay ahead of it during the snow, but got to it within few hours afterward - at one point it had over 12 inches. Push broom from the inside and it slid off with a some effort. There is some wear in places where the "tarp" contacts the frame - some thinning - but still completely intact - no rips/tears.
That said - I think where you locate it is key - mine is down a steep slope, in the woods, under heavy tree canopy (3rd pic, bottom right) - so even heavy gusts of wind haven't bothered it. If it was in the front yard, it would probably be gone by now. I only have the 4 "temporary" anchors that came with the kit (the good ones cost extra) and they haven't budged.
One member on here, Timber (I think) did a video on his install a few years ago. He put 4x4 posts in the ground (on the inside -2 on each side) and attached the steel poles to them. He also added webbing (rope or straps)between the "rafters" to help support snow load. I had intended to do this - but since snow/wind hasn't been a factor for me yet - never got to it. I did put self-tapping screws in everywhere the poles connect - this made the frame much sturdier. And I did buy foam pipe insulation to put on the stress points where the tarp contacts the frame - but never got to it either...
Another note - moisture buildup. Bare ground inside can make it like a greenhouse when its all closed up. I put a large tarp, doubled up, on the floor - 4 cinder blocks in each corner to hold it in place when driving on it - has worked pretty well. I figured to put rubber stall mats over the tarp, but they are expensive, and haven't needed them. SL sells a vent kit - but didn't like the price, or the idea of cutting the tarp to install it
SL also sells a door kit - think it is $40+ . I basically copied the design (pic 4) with a clothesline, small pulleys and S-hooks (<$10)
Hope this helps!