Salt Springs can handle a 40' MH well and have FHU. It's more like a big feild of site rows with having some trees but not that many.
Juniper Springs is a much nicer pleasant and prettier well forested really nice CG but as said not FHU or any HU's at all but has a good Bathhouse centrally located. Has a dump station just outside the 2 loop entrances with potable water also. Roads are all paved as are the sites for an RV and vehicle. Most all use their blue lagoon to empty their holding tanks as it just a short distance to the dump sataion t pull them behind a vehicle on the paved roads. However, many of the sites may be a real squeeze for a 40'er with a toad. We stayed a month or so for 4 years at Juniper Springs CG and loved it. Just recharge your batteries each day with a QUIET generator but can't be run at night. Having adequate solar will sure help but doesn't recharge much if cloudy and zero charge at nightime. A QUIET around 2000 watt generator is more than adequate and some were using 1000 watt Honda's to recharge their batteries and it worked fine for them.
Last time we were to Alexander Springs (about 6 years ago) the roads to get there were long, gravel and dirt, and quite dusty, and not very smooth at all. Don't know if they have paved them since. No Hookups like at Juniper.
I assume the Ocala NF still has much of it restricted as it's used for a practice bombing range. They can be very loud and shakes the RV's in the CG's as they are not many miles south of highway 40 east of Ocala. Never had them bomb at night.
