It depends upon what your camper is made of.
Campers made with wood frames usually have bat insulation in the walls already. To blow more would be impossible, as the gap between the outer wall and the inner wall is already filled. The space is only so thick, and there's only so much that can go in there. The space is already filled.
The other type of construction are aluminum framed walls, and they could be filled with bat insulation, or like my camper, the wall is actually nothing but solid Styrofoam with paneling on the inside and a skin on the outside. There is no gap between the inside and outside as it's already 100% filled with Styrofoam.
You would not want to put blown insulation under your floors either. If your camper has a nylon cover under it, the top of that cover usually has a layer of thin insulation. Add more weight, (and blown insulation does weigh) it would cause the nylon to sag and sag and sag.
If your camper has the plastic cardboard cover underneath, there again, the extra weight would probably cause it to break at each one of the screw holes.
Basically, what I'm saying is, blow insulation will not work in a camper, unless you are building your own from scratch, or completely gutting the inside and starting over.
