Another few things to consider,

Will your hotel staysalways cost no more than the $45 you figured?
If you decide to go somewhere new, how much willit cost to stay there?

With a hotel you may run into"sold out/no vacancy" nights, price increases and so on. With the trailer, it all comes down to where you can park it and if that costs a fee. And like said before, you can use that trailer for more. Fishing trips, maybe you can now make more and/or longer hunting trips, to new areas, etc. If you want to go home early or stay later, no worries. Your room is always there, and you don't even need to pack your things and vacate it.