Horatio,
In our local vernacular, I too am "a big 'ole boy". I use ladder stands only.
I am sure there will be plenty of folks who are themselves "big 'ole boys" who use hang on stands, and I have seen hang ons with weight limits up to 300lbs. For me they just don't cut it. I feel safer in a ladder stand. They don't shift as much or feel as tippy. Now, granted, a lot of this may be in my head, but what isn't? Ladder stands are not easy to move if you want to hunt in another spot, I have more than one. I am lucky enough to hunt on private land now. Our state laws are such that stands can not be left over night on state property, so when I hunted public land, I was strictly a ground hunter. I enjoy ground hunting still, but I like the option of stand hunting when I want.
I am not sure about where you hunt (public or private) or how your regs are, but I have buddies who hunted an area where some stands were going missing. They also used ladder stands and built them from treated lumber. The dang things were so big and heavy that it took 4 people to put them up, but sneaks had a pretty hard time walking off with them.
I usually make a point of looking at the sporting goods stores in Jan. and Feb. for good bargins on stands. I was able to pick up 2 very good 18ft. ladder stands for half price at the local farm and ranch store. They are already in the woods. I like to look for stands with arm rests and good padded seats (the arm rests, for me, are added safty since I sometimes like an afternoon nap in the stand, they keep me from falling out sideways while snoozing). Before you buy one of those "double" stands, take a look at the seat. I bought one thinking they would have more room. A mistake for me. The seats are very wide side to side, but very narrow front to back. It just wasn't comfortable for me. I gave it to a small size buddy to hunt out of with his daughter.
Here is the word on safety: Get a safety harness and use it! Most of the ones that come with the stands are too whimpy for us bigger dudes. I have one of the vest type with a 350 or 400lbs weight limit. It is comfortable and reliable. I can wear it over clothes in the warmer season, and under my outer most layer in cold weather. It packs up realativly small, and is always in my hunting pack. Since I always have it in the bottom of my pack, even though I may only be planning to ground hunt, it is there when inevitably I decide to stand hunt when the ground thing isn't working out. This saves a trip back to the truck, or worse a trip back to the house.
Hope this helps. I have several brands, but can't remember any of them right now. I can check if you want to know. If you go to build yourself one, holler at me. I have some plans around here in the office somewhere.
OkKeith