Outside Storage of Class C in the South-keeping critters out

Thank you all for your responses. I feel a little better now. We are not sure of where we are going to store it yet, but I do know where we won't store it!
We too had a snake show up on our porch this past spring (harmless) but long and unwanted just the same. We let him slither on to go kill other things we don't want. The thoughts of getting one in a trailer or motor home creeps me out.