We use Fresh Step Clumping at home and in the camper.
Our cat gets motion sickness, so the initial 20 - 30 minutes, the cat and litter box are in the shower stall with the glass door latched. After he's finished with his barfing, his pooing, and his peeing (and now, IN the litter box), he's OK to come forward with us (in the truck)... we have a TT. After the first 30 minutes he's perfectly OK then.
If we get out of the truck, we always take him back to the shower in the camper, so he's easier to get back out when we hit the road again.
Once at the camp ground, the cat litter comes out. We have one spot that works well for us, and we usually keep a run under the litter pan so the litter won't spread too far. A good broom and a good vacuum are 2 good friends to travel with you.
Once at the camp site, I always take the cat outside, on a short leash and walk him around as I carry him. He get's so petrified at the new surroundings, he wants to go back into the camper and then, the rest of the time there, he has no desire to try to get outside.
If he does get curious, I'll leash him up again for another walk. In just a couple minutes, his curiosity is satisfied, and he's flipping out, can't get back to the camper fast enough.
This works very well for us.
We go through this exercise every day, but we've not lost Mr. Kitty yet. Once he got loose, jumped out the camper door, ran to the edge of the campsite, glared, turned back around and storm troopered back to the door. It was open and he bolted back in and hid in his cubby hole.
Yet at home, he will come and go from the camper with no problem at all. He actually enjoys the camper. Many times at home, he'll be sitting on the camper step, saying ... "Hey Dad! Let me inside! There's a litter pan in there calling my number!" ... pun intended!