I was there at the Fort checking in on Thanksgiving (2016) day and leaving about 9 days later. I also rented a cart from Tee Time.
They charge $35/day (give or take depending on how long, how large, etc...) with a 10% deposit due at reservation (non-refundable) and the balance due 10 days out. This also represents their cancellation period (10 days).
Anyway, you meet them behind Chili's Grill and Bar (on S Apopka Vineland Rd) about 6 miles away. You can either hook their trailer up to your vehicle or use their truck (with the trailer attached) to bring the cart into the fort. It's real easy to get to Chili's too. (Left out of the fort to the last light. Right on Winter Garden Vineland Rd To S Apopka Vineland rd. Make a left and Chili's is down a short way on the left).
Since either way you have to come back (to either drop off the trailer or the truck with trailer) you can plan on the whole process taking about an hour maybe a bit longer.
I used their truck (although I could have towed with mine, I felt it was quicker to just use theirs then to try and unhook, re-hook, then come back and Unhook again). I just parked my truck there and locked it. They did not want to hang on to the keys for my truck or anything. The gentleman there waiting was nice, but very quiet. (definitely seemed to be introverted) and seemed to Speak Spanish natively (although he could speak English too. It's just he said so little and was soft spoken when he did talk). The truck was an older F250 that had over 200K miles on it. It was well used and I wouldn't want to have to take it for a LONG trip (i.e. towing our TT from PA to FL.) but it did the job. I towed back to the campground (make sure you have your MB to get back in easily) to my site.... Easy to "Unload" (2 tie down ratchet straps and a drop down gate and drive it off the trailer). Closed the trailer back up, put the straps in the bed of the truck and drove back. Picked up my paperwork, truck and went back to the site. Was done in about an hour.
If I had any complaint it was more about the "Scheduling" of pick-up/drop-off. It does get challenging working their schedule into your schedule. If you wanted to be at a park for Rope Drop the same day you were to pick up your cart, it does get challenging. Plus they did try to "Change" my Pick-up time. (I wanted as early as possible to maximize the day. I got 7AM, then it got moved to 730, then back to 7, then they tried to do 8. I think in the end I got it at the original time of 730). For us we could not pick it up on arrival day as they were closed that day (it was after all Thanksgiving.) but that's okay, as we didn't really need it that day anyway. (not that we "NEEDED" it at all, it was just a nice to have at the right price).
So was the inconvenience of going to get the cart (and drop it back off) worth it? Well, for us it saved us about $200 over getting a cart from the Fort. If you are only going to need it for a couple of days (I'd have to say about 4 days or less), then the hassle is probably not worth it.
I was very happy with the service overall I got from Tee Time and I would use them again. That's not to say that the service from the Fort is bad. It's just a matter of cost.
to the DIS Camping Board 
