Thanks for the kind words! We're planning to leave on our overland trip in about a month (*gulp*) so we'll be testing it out full time very soon!
By 17's do you mean 17" rims? I'm not sure that would make any difference on whether the door will clear. It's more the width of the tire - my old ones were 305s, and the door opened all the way but rubbed on the tire. The new tires are 285s, and the door just barely clears the tire. The only real difference is that now I can move the van with the door open if I want to.
Personally I like the look of the 285s better than the 305s. They're the same height (diameter) as the old tires, so being narrower they look a little taller even though they're not. Also, now that we can't get the bushwhacker fender flares for the slider anymore, it's nice that the tires don't stick out from the wheel wells as much.
As for performance, I don't think I'm going to notice any difference. We're building our van for long term travel; the 4x4 is mostly insurance to allow us to camp on the beach or turn down a dirt track in the rain without worrying. So we're not going for extra large tires, additional lift, or anything like that.
Oh, and I'm also hoping the narrower tires will improve my fuel economy a little, but I haven't driven it enough to figure that out yet.