No power for your air conditioning in Everglades unless you go to Flamingo Nat Park at the tip of Everglades. OR, stay at a private RV park.
Parking at Shark Valley and Anhinga Trail is right at the ranger stations -- rangers all over the place, and very crowded in spring/winter/fall ... will be VERY HOT in summer. AND, you will see very limited wildlife because it's hot, and the water table is down in summer. RV is relatively safe in those two areas.
There are some parts of the park which are unsafe to leave RV parked - talk to the rangers when you arrive and they will advise you.
If you can plan any other season, you will have better luck. The good thing, you will have NO problem getting Elect HU in Flamingo that time of year if you overnight in the park ...
I'd really, really recommend you go at a different season, and winter is crowded but best for wildlife and climate. Shark Valley and Anhinga Trail are two of the highlights of Everglades, you have that part correct. But, I'd also go all the way to Flamingo as well -- that's a very nice area.
Everglades is one or our favorites - but we'd NEVER go in summer, and we live in Florida. Everglades is an amazing place, and well worth spending some time there -- less worth it in summer for reasons above.
Personally, I'd spend less time in the Keys and more time in Everglades if I were RV'ing the south Florida area. Keys is a great place for boating and fishing -- not RV'ing, unless you're a boating and fishing person while you RV.
Hope that helps -- PM me if you want more personalized info -- we've spent a lot of time in Everglades areas.
