[Gu]estimate will do, on the side of caution that is.
All that's happening here Ben is they are making it your responsibility to make sure all the equipment you have will fit on the site. People are probably in the habit of turning up with extra tents and a couple of extra cars and trailers and then moan that they can't fit on the site they booked.
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Clicking the thumbnail pictures below will display detailed capacity information for each of the sites displayed.
By clicking on the image on the Bridge Bay campground I got 3 options and selected Large tent site only and got the following info.
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Capacity for Bridge Bay Campground Large Tent-Only Site:
One large tent, 12'x12' or smaller and 2 cars or
Two small tents, each 8'x8' or smaller and 2 cars
That will be plenty big enough and unless you entered equipment size that exceeded the above mentioned options you will be fine.
When asking for your equipment size just veer on the side of caution as there is no harm in having a site a little bigger than you need, but is a problem if it's not big enough ! The options are for the maximum capacity of the site and you won't be anywhere near that anyway.
So check out the vehicle lenght, 16 feet should cover up to a mid-size sedan[and you won't have a trailer], plus your tent size. If you are thinking 6ft x 8ft but unsure you could cover yourself and say 8ft x 10ft, but it's important to keep it as near as sensibly possible so that someone with a big outfit doesn't miss out on a site that might be much bigger than you actually need.