87 gmc c30 what size bags and 4 link 4 rear

i plan on baging my dually and wanted to now what would be the best bags for towing and also what would be the best link..i have thought about a 2 link design and also a paralle ..both with the bags over the axle or behind

When towing I personally would go with bags over axle.  You can run a parallel and be fine but thats all preference really.Search on here and look at a few dually's on what size there runnin I would but I'm at work and don't have to much time.

well i would like to run the 10k bags but i also like the tripple bellow contiects...

and how much bodydrop do these need to lay rocker