Dust from rear door/hatch?

I’m working on the design of my little camper and just can’t decide how to seal the rear hatch and or doors. I live in a dry and dusty area, and most any trip will entail at least some driving on dirt roads.
We have a pickup with a very nice ARE topper and it still gets dust inside.
HOW do you guys seal rear hatches or swinging doors to keep the dust out? A side door is relatively easy, IMO. The ‘vacuum’ on the rear of a flat back design, or even teardrop invites dust.
HELP?
We have a pickup with a very nice ARE topper and it still gets dust inside.
HOW do you guys seal rear hatches or swinging doors to keep the dust out? A side door is relatively easy, IMO. The ‘vacuum’ on the rear of a flat back design, or even teardrop invites dust.
HELP?