I use a Polaris net on the back. Installed a Wolfsnout cool cab kit which really seals out dust coming through the gaps in the firewall in addition to keeping radiator heat out. I sealed all the gaps in the back of the cab by lining the back with 1/2" foam. That keeps heat and noise down while also preventing dust intrusion. Very little dust comes in the cab when I'm in the lead. Not much a guy can do if it's dusty and you're at the back of the pack. Break out the dust mask and goggles and just pretend I'm farming with my old open station WD-9.