I'm in the new P-5700, was excited to see that it had the cargo pressurization vent. My route is rural and I drive on average 250 miles per day, with at least 50 to 60% on dirt roads. The old P-500 I used weatherstrip around the rear doors coupled with motorcycle tie-downs to reef the mothers tight, worked pretty well. On the Sprinter I had for 3 years, the tie-downs on the rear doors worked ok, but the side door was a vacuum. BUT THIS car is AMAZING! I'm having to hose it out every night. I've sealed the gaps at the top of the forward portion to keep the pressure in the cargo area, but still not much success. The cab isn't much better, the doors don't fit to the curve of the opening, and the dirt rolls in freely on each side there too. It appears that the flooring is individual aluminum panels that are about 8" wide and run from side to side of the car. Each joint dosen't appear to be sealed, so the plan for this am is to duct tape each joint, as they are too narrow to really get any silicone in them. I know that this is going to be a temporary fix and will require lots of repair as the boxes rub, roll up and catch the tape, but I'm at wits end with this dirt hole. I changed the filter on my shop vac last weekend, and when I popped the top off of the canister, it looked so clean and inviting compared to this car. Every night I look like I've been crawling in the borrow pit for a few hundred yards. Has anyone else been having this problem, any other discoveries on where the holes are? Is there a "Hoover" placard located somewhere that I've missed?