That's a smoking deal IMO. I think the 43qt (what I have) will meet your needs. While it may seem too small, remember that there is no need to leave room for ice. If you use it at home as well, it really will pay for itself in short order. I don't have the math, but just think of how many times a day you open the 'fridge to get something to drink, dumping all of the cold air out, vs opening the lid on a smaller chest 'fridge, all of the cold air stays in it, and the kid can do it herself without dumping the milk out on the kitchen floor! (let me know if that argument works)
The 86qt is tempting just for home patio use. The only way I'd take it camping is if I was taking my enclosed trailer.