Keeping 5th wheel from drawing in dust.

Drive the gravel in the rain,the rain will keep the dust down.:)
Then you just have to pressure wash the camper!
We drove the Dempster Hwy. from Dawson to Inuvik, 750 km. Wet on the way up, dry on the way down.Had to pressure wash the back of the camper half way up so we could get into it, and again once we got to Inuvik. On the way South, nice and dry and the dust found its way in everywhere. We hung a blanket across the door on the inside and held the sides in with velcro strips the second day and that helped but there was still dust everywhere.
I installed that vee shaped weatherstrip around the door, and a big door sweep to try and keep the dust out. It helped to keep some out but we still vacuumed after driving some other gravel roads in the North.

No way you will keep the dust out

Dust is a fact of life with dirt roads, and I don't think it's practical to seal a trailer up so none gets in - it seems to always find a way. But it's worth it and while 100 miles of gravel may sound like a lot to some, it's really no big deal.

If you are going to go off road for 100 miles, you are going to get dirty. It's the price you pay for getting to that secret fishing hole.

Have a good trip and when you get back, post some pics of the big ones.

How about some wide blue painters tape. Comes off easily and should seal up the doors etc., at least help.

IMO a small volume fan sucking air in would only make things worse. Seems if there is enough space for the air to go in so will the dust. But I have no idea really.

I know the painters tape would work at least partially.

What about the roof vents for the fridg and a/c ? Sounds like a mess to me.

While I would not pull my FW over 100s of miles of gravel to go fishing, (I'd take the tent) I do think it would help to run the fantastic fan, drawing in air to keep dust out. The bad thing; with fan at rear of trailer, depending on actual location, could suck dust, from the back wash of air following the moving trailer.

I can say from experience, out hunting, with vehicles driving in really dirty/dusty conditions, it did help a lot to turn the vehicle fan on, to force air into the cab, and keep dust out.

Jerry

Tape around all doors and slide outs. This should reduce the intake of dirt while traveling.

Short of hauling a very large pressurized container of air (unpractical) the only way to pressurize a trailer would be to pull outside air (and dust) into the trailer. Sealing it up would be the way to go but you are never going to get every little hole.

HUmmmmmmmmmmm

Fan on blowing into rig.......except it has to suck outside air in
Fan on exhausting out of rig.....sucks inside air to blow out which means air has to leak into rig from cracks/holes/gaps etc

RV's are not 'air tight'

Bathroom fan, bedroom & living room fans are NOT high enough CFM to 'pressurize' an RV

Close up vents, close windows tight, slide out in and tight (as much as can reasonably be done), close entry door and call it good.
Then minor dusting when you set up----go FISHING and forget about it until you get back home

It's a fishing trip...not a RV Show