LT doesn't sound like the right fit for your terrain. In order to get that travel the tires need to be pushed away from the vehicle making the track width wider. When that happens you won't be able to get through narrow trails (obviously) but you will then need to widen the rear to make it even with the front to keep that roll center correct.
I think you should absolutely do a SAS on your truck you have now. It's not that hard especially if you do a leaf sprung set up. There are kits you can order online which are practically bolt on once the hangers are welded on. Either way you will need to do some fabrication even for LT so I wouldn't toss the idea. Yes SAF trucks sit a bit higher but it takes a lot to roll a vehicle.
You are better off finding a solid axle and doing some research on which axles you can find at junkyards that will bolt up to your drive line. I'm sure it has been beat to death on other 4x4 forums so you might want to google it and see what you come up with.
I would venture to say you will be 100% satisfied with the way it works, the simplicity of it, and how it performs.