In the 90's I went windsurfing in the Columbia River Gorge most summer weekends . I saw darn near every conceviable camping set up known to man.
I specifically remember a weekend at 3 Mile Canyon.
3 Mile Canyon is not a campground, just a parking area and a boat launch. Signs are posted every 100 yards or so warning of rattle snakes.
On this particular weekend I was in a 19' class c minihome. (remember the rattle snakes)
There was a group from Cali that were tent camping.
One guy had a tent setup like the op has posted. Dont think it had as elaborate a fly set up but very similiar.
Another guy had a pup tent he had set up on the ground.
Over night it rained, the guys with the pickup bed tent had a swimming pool in his tent.
The guys on the ground were nice and dry, the gravel had provided good drainage. They were laughing their butts off at the friend with the pickup tent.
That day the wind was non existant, the river was glass.
Time to break camp and head towards the coast and find some wind.
The guys started breaking down their tent, packing up their sleeping bags, etc.
When they broke down the tent, one guy screamed like a litte girl, there was a 2 ft long rattler under the tent, LOL.
Now that was some funny shit, the guy with the pickup laying it on them about sleeping with snakes, the tent guy saying he was never coming here again.