Oddly enough, if I sell my rig for NADA value, I actually have made out better than staying in hotels. My total depreciation is about $5000. However, if I amortize that over more than 75 nights camped, then the result is definitely less than what even the cheapest roach trap would cost in the areas I am staying. To boot, no worries about bedbugs, or if the room previously was used as a meth lab. If I boondock another season in my travel trailer, it amortizes the depreciation even further.
Of course, this doesn't include expenses like propane, food, paying for the honey wagon, etc... but done right with the right gear, it can be done for fairly inexpensively.