Powerchairs can ONLY go on the launch with the green flag which goes directly to the Magic Kingdom. At times, the launch has a green/red flag which means it will also stop at the Wilderness Lodge. There is no ramp to get on the launches. Sometimes the dock and launch heights are mismatched. Disney cast members are not allowed to physically assist (push/pull/lift) getting the chair on/off the launch. They will, however, get people to move so the launch will tip more to one side helping to level the two out. So be sure somebody is there to assist the power chair user. You cannot get a power chair on a launch that goes to the Contemporary. Only the small launches go to the Contemporary. You must get there by car, bus or monorail.
Powerchair Rentals: Places that rent powerchairs also have technicians that can repair them, some will even come to your site. If special attachments are required for the power chair, they may also have those available. You might want to give them a call to discuss before you bring another heavy chair.
Discounts: Only discount available anymore for campsites is AAA. All the rest have been discontinued. And there is no guarantee AAA will be available for your stay or if it will be available for a Premium site. Keep calling and checking to see if AAA can be applied to your reservation (assuming you have AAA).
Rates: AllEars.net provides a nice little chart of the rates. Look here: Fort Wilderness Resort and Campground Fact Sheet
Lower rates do not always mean smaller crowds. Lower rates during winter in Florida (January) also means its spring/summer in some foreign countries which means that you could possibly run into some huge tour groups. There are also race weekends, cheerleader competition time, etc., and some winter holiday weekends (President's Day) that can get very busy, especially at Magic Kingdom. Maybe not as mobbed as spring/summer in Florida, but still very busy.
Sites: Again, you can call or fax in a request, but there are no guarantees you will get that specific site. If you don't like your site, call the front desk and ask about getting it changed. Fort Fiends does indeed have a very nice app showing most all the sites with their measurements and where the utilities are located and indicating the degree of difficulty in accessing the site.
Don't forget sign into "My Disney Experience" If you have time, you can customize (by color and name) your MagicBands, otherwise you will get the standard gray bands when you check in. Among other things, you can link your tickets to the MagicBand for entrance into the parks and also to get your FastPass+ (there are no more paper Fast Passes available).
One more thing, if the power chair is used for something OTHER than a mobility issue, the user may be able to get a Disability Access Card (DAS) to use for assistance getting onto an attraction. DAS is strictly for persons who are unable, for one reason or another, to be standing/waiting in attraction lines. There is a whole set of rules and regulations around receiving one of these cards. But it can be very useful if you have somebody with issues other than just mobility. DAS cards are issued at Guest Services in each of the parks. Some attractions (like Big Thunder Mountain and Space Mountain) may have stairs or are otherwise unable to be used by power chairs. At those attractions, if you don't have a FastPass+ you will need to get a wheelchair access card which will give you a return time to come back and ride the attraction by going through the FastPass+ line. The return time on the card will be set at whatever the current wait time is less 10 minutes.
When you enter one of the parks be sure to pick up a Disability brochure. It will tell you what attractions are mainstreamed and which you will need to get a wheelchair card. It will also show you where Companion Bathrooms are located and other Handicapped bathrooms.
When are you coming? We're here frequently and would be happy to meet and give you anymore information, tips we might have available. Send me a PM with your info if you want.
There are ways to get just about anything you need that you may have forgotten, but most importantly, HAVE FUN !