We had a cabin built 2 years ago. It’s 1,600 sq ft. with a wrap around deck. Cabin is supported on concrete cinder blocks. The decking is supported by 4×4 posts at 6 ft intervals. Built on a slope, the front is ground level and the back is 8 ft high. My question: Are 4x4s sufficient support or should I look at replacing with stronger support (6×6). It’s been suggested that in time, I could develop severe problems.