i live in the "south". without concrete blocks....most mobile homes would have still have wheels under em!!!! andddddddd without concrete blocks...most of these trailers would not have the trans-camero yard art, dog houses and chicken coops!!!!!!!!!!!heheheheh. concrete blocks are very sturdy...unless they are old. yes its better to put wood on the top to distubute the weight. my self iam an old country boy. i like to use....real oak(not southern silk oak) or pine LOGS.. find a tree thats 10-12 inch dia, and cut with a chain saw, 14-16" tall(got cut em straight, top and bottom). this way if ya dont "getaroundtoit" to fix it...they will sprout new trees.....hehehehehehehe