Well, it depends in the country, for example, in Spain, it doesnt matter if you call both the trailer and the motorhome "caravana" which means "caravan" obviously, but, if you want to be more precise, you call "caravana" (caravan) to the trailer and "autocaravana" to the motorhome, and for other countries i dont know, in The UK for sure they cal the trailer caravan, but i think the "motorhome" is called camper or soemtimes just motorhome too, like in america, someone from there will tell you better than me, but well, that's the case for Spain.