Just a word of caution:
Whether using an app or a website (WP is one I've looked at), setting a goal of getting a SPECIFIC site or two is generally an exercise in futility although it does happen occasionally. A site has to be empty the night before or a guest on it leaving that morning for you to be assigned (or swapped) to it and honestly, lately, the Fort has been staying more full than ever so the empty-the-night-before happens less and less.
So IMO going for a specific site is high-expectation-low-return.
A better option is to put a comment/note on your reservation (if you made the reservation on-line, call Disney and ask to have it added) that you have a 40' trailer with 3 slides. That way, whatever sites do come available for your site level and arrival day, they will have that information and pre-assign you a site that you can fit into. A size comment on a reservation is a common occurrence and has had a much higher success percentage. And if you get a Premium, it will be big enough.
One person's "favorite" site is another person's "eh" site

. So I really want to dissuade you from getting hung up on a specific site. Add a comment and let Disney worry about it. It will work out.
Bama Ed
PS - also the reference sources include a rating of how easy it is to back into. Regardless of where that recommendation comes from, again, a site rated easy may be hard for some. That feedback has been heard more than once here in the past...
PPS - and welcome back, ukintheus.
