GuyInDiana, looking (well actually staring) at the right hand print, that doesn't seem consistent with it leaning over to peek in the window. The left hand seems more solidly placed, but the right looks like it quite obviously slid on the glass. Yet, not with the full hand in contact with the glass. I wonder if what we're looking at is an attempt to push the camper over or at least rock it.
The reason I say that is because if you're applying force in an upward motion, that would account for the smear pattern of the 'pinky' finger moving in an opposite direction to the thumb, index and middle fingers. What's odd is the lack of impression of the ring finger. So of course I've tested with my own hand. If you're applying pressure and sliding your hand to the right, your ring finger does seem to push up off the surface, along with the middle finger to a lesser degree.
The next thing is that there seems to be more sand in the glass print vs. the lower print. This leads me to believe that the first attempt was on the glass. It seems that it was smart enough to realize the hand slides on the glass, therefore, it next tries lower on the siding leaving less sand this time.
Another interpretation could be the high and low prints are the first impressions before it looks in the window, when it sees its reflection causing it to swipe at the other face to push it away. The only problem with this interpretation is that in this scenario, I'd think the whole print would smear to the right with little upward movement and that it would include more of the whole palm.
The last thing is the very fact that there is so much sand and mud for something that supposedly is an upright walking creature. This leads me to think that the approach to the camper was done stealthily using hands on the ground in the process. I suppose it may have just been playing in the sand at the riverbank and decided to stop by.
The question is - do you ever go there and find things inside knocked over consistent with something shaking the camper?