I have a pull coming up that doesn't allow me to put weight "past the front bumper"

I have some suitcase weights but am having trouble figuring out how to hang them safely from the frame. Below are shots of where I'd like to hang them. Any ideas?

 

What about hanging them between the rails with 1 1/4 x 4 channel and bolting them closest to the LH side. BTW...Where did you find the Massey weights, those are almost a collectors item.

 

Get a piece of channel weld the ends shut, weld some brackets to bolt to the frame, pour it full of lead. If you use lead you can get a lot more weight in a smaller area.

 

I sort of did that, ended up using a different type of weight, but it will work great. Thanks!