It is all dependent. If you wheel hard, then yes, you will break parts. You can break 1 ton gear with 37's if you wheel hard enough. I have seen people here in AZ run the rocks pretty damn hard with 1/2 ton gear and 35" and survive pretty well. Yes you are going to break parts with 1/2 ton gear. Your driving style will determine weither you can make 1/2 and 37" survive.
If you drive hard then 1 ton is probably the best option. If you drive smart the 1/2 ton can survive. Just carry spare axleshafts.