Eileen, I think it depends on the length of the trip and the terrain you'll be traveling through.
I can only speak for road trips in the U.S. where the daily fee for a spot to park a caravan (what we call a travel trailer or 5th Wheel) is quite reasonable, around USD$15-25 per night. I have cousins who go all over the U.S. this way and say they wouldn't have it any other way, even after factoring in the cost of buying petrol more often because of the reduction in mpg (miles per gallon) from pulling their "home away from home" (which contains a full-size freezer full of meat purchased before leaving home!).
Also, one has to factor in the cost of repairing (and towing!) the vehicle towing the caravan if it breaks down during the trip, in a place where repairs may be much more expensive than the same repairs would cost at your local garage. Or, as happened to my cousins, the problem that caused the breakdown may be deemed not worth fixing and a new vehicle will have to be purchased to continue the trip.
That said, the main disadvantage of towing a caravan is it's not cost-effective to pull a travel trailer in mountainous regions, or in areas with a lot of twisty-turny roads that require repeatedly slowing down and speeding up. Either scenario dramatically reduces gas mileage which in turn requires buying petrol more often than the budget allows.
If traveling in such areas, cabins would probably be the cheaper option.