We have an RV we take occassionally (to extend stays at Ft. wilderness for the weekends). I would suspect rules might be similar.
1. You will not have electrical hookups anywhere.
2. OKW, no units over 24 feet long, and must fit within the lines marked for an individual vehicle. If you can't meet this, then you must park at Port Orleans.
3. BWV, can park in the back lot only. Way back by the taxi waiting area. Cannot park in the main self park lot.
4. BCV, OK to park there but they request you park way in the back.
5. VWL, similar to BCV, you are asked to park way in the back, not in the regular parking spaces.
Don't know about SSR or AKV. I would suspect SSR is similar to OKW. AKV might let you park way in the back away from the most commonly used areas.
If this is the only vehicle you'll have, I think you can still use the common parking lot at Ft. Wilderness and uncouple the boat and leave it there. Then use the truck for regular transportation.