We live in Orlando. Living in Lauderdale, I'm surprised this is your first encounter. Those little guys are like mice.....they can get in anywhere. We've even found them inside the gas cap on my wife's car. The slipped in there through the small crack where the fuel door meets the body. If I had to make a guess, based on where you found it, I would say to take a look at the threshold under your door. If you look straight down where the outer wall of the camper meets the floor at the sill, I'll bet you can see daylight below. That seems to be a FR trademark!
2015 Legacy SR340 360RB
2014 Jeep Wrangler Unlimited Toad
Gigi, Poppy and Sadie Lady...On the road, but not full time!