2008 Intl 28
I bought that same trailer in Dec, and have been towing it with a E350 Van. We also have a Ford Expedition, both have the 5.4l V8. The Expedition isn't setup quite yet, but we plan to add the brake controller soon to allow for some flexibility. So far the E350 seems to work great with enough power to get around, the primary difference from the expedition is the longer wheelbase, as pointed out this has some advantages.
I ordered the Equalizer hitch from Ebay, best deal was from a trailer place in Eugene OR. Do the setup yourself based on the instructions, my airstream dealer eyeballed it (they don't rep them) and it wasn't correct. MUCH better after we tweaked it, several threads here discuss how to use a weigh station for optimum results.