Option 2 (fly down, rent camper, have food delivered)
Flight (5 people from Hartford, CT) $2300
Food (14 days @ $40/day estimate) $560
Camper (9 nights @ $135/day) $1215
Golf cart rental (9 days @ $50/day) $450
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$4525
Don't forget that you have to add the cost of the FW site to this.
You're right! That adds another $720 to option 2 = $5245.
Also, I think that, if we still had our pop-up, Option 1 would have been a bit different - as we would have stayed in motels on the way down and gone with a Disney meal plan instead of having meals in the camper. Towing the pup got us a bit better mileage too. So, more like this:
Option 1 (drive down = 2 nights hotel each way = 4 extra vacation days)
Bring bikes ($0)
Fuel (200 gallons @ $4/gallon) - $800
Camp fees (9 nights @ $80/night) $720
Trip motel fees (4 nights @ $80/night)$320
Trip Food (6 days @ $80/day estimate) $480
Disney Meal Plan (3 @ $40 + 2 @ $11 for 9 nights) $1278
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$3598