Saw dust or sand?

[beehappy33]

We just bought our second travel trailer and have only taken it out a couple of times. When I opened the door today to load up for our next adventure, there is this saw dust or sand like stuff all over the floor? (It is also on the bed above the vent)
I didn't notice this with the first camper. Does anyone know what is causing it and should I be concerned?
Pulling a 31 ft Wildcat with 2 slides.

[beehappy33]

Thanks everyone for the help!

[Rovito]

My first thought was ants.

[trail-explorer]

Is it new or preowned?

[Mike_Up]

Maybe carpenter ants. Keep an eye out. They have destroyed my rear door.

[Winnebago_Bob]

Arctic Fox 28F. Cleaned it when we brought it home and never saw sawdust since.

Very odd something would appear while being stored.

[downtheroad]

troubledwaters above beat me to it.

[troubledwaters]

There shouldn't be any sawdust falling out while it's just sitting there. While traveling down the road, yes; sitting parked, no. If there is sawdust falling out while it is sitting parked I would look for carpenter ant activity.

[time2roll]

After 12 years I still have sawdust coming out of the nooks.

[ScottG]

If you take out a ceiling light and put a couple of fingers up on the top side of the ceiling panel, you'll find it's covered in sawdust. Our last two trailers were like this and even after 13 years we still find sawdust in light fixtures and inside the cabin occasionally.

[RoyB]

saw dust will burn sand will not

[RobWNY]

It's probably the sawdust that was created when it was built. I had the same problem with our travel trailer the first season after we bought it. They're built as fast as they can be and there's no cleanup involved after they saw something. It works its way through the joints when bouncing on down the highway.