2015 F350 2WD DRW, 4300 lb Bigfoot. Hellwig Bigwig front and rear. If you fit only the rear handling will be "unusual" with the bed empty. When I was fitting the air rear suspension, I had to remove the Hellwig rear and put the stock one back, still had the Hellwig front. The rear bar was definitely missed. Made some new links so I could put the Hellwig rear back on and it was well worth the effort.
You do not mention 2WD or 4WD. If 2WD only Hellwig makes the front bar I think. 4WD also Roadmaster. Generally speaking I think Roadmaster is a little better quality in the details, however I do not like how they chose to mount the rear bar on the 2015. Both brands work.
Hellwig wants you to use their links for the rear which are stronger than the stock. If you have a diesel, R&R'ing the driver's side link is a PITA. You must either loosen the DEF tank and work around it, or drop the spare tire and reach over the top with a combination of extensions, universals, and profanity.
Roadmaster rear says use the stock links. The bar is something like 5 times as stiff though, and those links and attachments look marginal to me at 5 times their designed stress. Roadmaster offers links for trucks that don't have stock ones, and they are far more substantial than the stock ones. But then you have to R&R the drivers side.....
