While the video link below is NOT a SmithCo brand, I think your viewers may enjoy the video. Here's a link to a 14th scale RC side dump tractor trailer. The truck & trailer have fully functional air ride suspension systems! The trailer is hydraulically operated. ruclips.net/video/gBPLPIYqyeI/видео.html
Do you have a model that could work for Scrap metal? How much weight can you load and dump safely?
This will be my choice.
While the video link below is NOT a SmithCo brand, I think your viewers may enjoy the video. Here's a link to a 14th scale RC side dump tractor trailer. The truck & trailer have fully functional air ride suspension systems! The trailer is hydraulically operated.
ruclips.net/video/gBPLPIYqyeI/видео.html