Well, girl disney, you chose the second most expensive time to stay at the Fort (after Christmas/New Years time). Most of March is priced to capture the spring break folks who are captives to their school calendars. The weeks before/after Easter (which is a moving holiday) are also very expensive.
I prep a table of campsite costs as they become available for the coming year. 2020 rates are here:
FW 2020 Rates see post #21 and 2021, although bookable on the phone, exact rates haven't been set yet for 2021 so they work from the 2020 rates. For those reading, using this can give you an idea of how much rates vary during the course of the year. My link also has 2019 rates under the 2020 rates so you can see year-over-year change (note Premium Meadow are new for 2020 and were "carved out" of the 2019 Premium inventory).
To answer your question, there are off-site options within a 30 minute drive of WDW.
KOA Kissimmee: east of WDW on Hwy 192. We've had folks stay there recently and say it was small but nice.
Nearest KOA
Lake Louisa State Park: Florida state park just south of Clairmont on Hwy 27 west of WDW. I stay here one night before my arrival at the Fort-30 minutes to the MK Toll Booth. You reserve a specific site-very few have shade. Note no AC in Comfort Stations (which are nice otherwise) oh and close to civilization (WalMart, Walgreens, restaurants, etc.). $24 sites (some with sewer) with an 11 month booking window.
LLSP on Reserve America
The following are various forms of rv parks/campsites with a mix of time share or club ownership, long term guests, etc. but allow short term stays (space permitting). I have not stayed at any of these and don't have an idea on rates but they have been mentioned here.
- Thousand Trails: Orlando RV Resort. South of Lake Louisa SP on Hwy 27 -
Orlando RV
- Encore: Lake Magic west of WDW on Hwy 192 -
Lake Magic
- Encore: Sherwood Forest east of WDW on Hwy 192 -
Sherwood Forest
- Encore: Tropical Palms east of WDW on Hwy 192 (closer than Sherwood) -
Tropical Palms
Encore owns Thousand Trails or visa versa or they have a co-marketing arrangement. You'll see the other's logo on each site usually. Dunno.
You will want to probably sit on your Fort reservation until rates for these become available for 2021 travel. And of course you would have to pay the daily rate for theme park parking and lose 30 days on FP booking. Due to the time of year these other places will also have high rates (although not FW level) so you can decide if the savings are still worth it.
Good luck!
Bama Ed