We're new to Legends cars and are needing to mount lead(about 70#). Can I safely drill the lower frame rail on the left side? The car came with 2 holes pre-drilled on left side frame rail but I'd really like to hang another weight there as well.(further back) We're really stumped as to where we're going to put all this weight. With the largest allowable weight being 1.5x2.5x12, we'll have to bolt on 4 this size to make weight. Any input would be greatly appreciated. Thanks, Jim