Personally, I'm in wuvv with the Volvo XC70 but am prolly dreaming. Commonsense says that one should stay away from semi- exotic cars whilst driving cross country, especially when one knows absolutely nothing about engines.
You'll be bumping up against the maximum towing capacity ratings with the XC70 and the trailer you've chosen.
Up here, in the Land of 10,000 Lutefisk dinners, the Volvo is ubiquitous, as are many other medium SUV's. This is the new soccer Mom transporter, replacing the mini-van as a family vehicle. There are heaps of Lexus E370's and BMW X5's running down the roads, especially in the Suburbs.
You will have a lengthier selection process when choosing a uni-body vehicle for towing. I've read where many are happy with a diesel Touareg or Mercedes SUV.
Out of any you have listed the Ford V6 Ecoboost is probably best mated for towing, disallowing any diesel models.
If your cross-country trip is going to be a one-off, have you investigated renting or leasing a vehicle for the trip and then buying an urban commuter?