About $5000, more or less, depending on your ports and where you are going, and how you want to do it, how soon you want to get it. That's my current guess, based on past experience moving around as an expat worker. That would be container shipping, delivery within a few weeks of dropping it off. At that price, you (or your agent) needs to be there to receive it, and deal with customs, when it arrives.
You can make that range about $3000 to $10,000+ in you want to include the extremes, from a roll-on to a tramp steamer with delivery whenever it gets to your port, to air freight at the other end of the scale. For a motorhome, maybe a whole lot more for air freight, as it may not fit through the door of the freighters used on regularly scheduled routes, and could require a military-type cargo plane.
There are also costs of preparation for shipping, then preparation for use. Motor vehicles usually have to ship dry, and without other goods (like personal effects and camping gear). Not always, because there are drive-on carriers, but they are not going to put your motorhome into a container or cargo hold full of fuel.
There may also be substantial customs bonds required, depending on the destination, for some countries possibly as high as the local value of the motor vehicle. That can also come up when you drive in to certain countries, at discretion of local officials. Most of western Europe, within EU and Schengen, is probably not too bad on customs once you get in, but watch out for places not part of the customs unions.
Then you have to get it back to the U.S., so double the cost, and maybe the hassle. When I moved to China, they didn't even break the seals on the containers. When I came back, ICE went through everything. Fortunately, I had good agents receiving for me.
There are a number of autombile shipping agents on-line, most handle just about anything. Any could give you a quote if you are ready to say what, when, where and how, and they will help you understand the details.
