The ground underneath ought to be level and steady, with base plates for also weight distribution. https://o5idyumn6nai46fcubylnqtelw6i4vztkvabnznb2f6Jsjfmfl7a.cdn.ampproject.org/c/bbs.pku.Edu.cn%2Fv2%2Fjump-to.php%3Furl%3Dhttps%3A%2F%2Fkensingtonscaffolding.co.uk%2Findex.html/