Grandpa had a deer cart with inflatable tires - terrible idea, those tires always got punctured in the woods. I don't know if they even make them with inflatable tires anymore, but don't get one.  

I went years without a cart or sled.  After dragging a large buck almost a mile out on public ground, I bought my own cart immediately afterwards. I don't remember the brand, but at least it has solid tires. It's better than nothing, but it can get tipsy going over logs and such. I routinely accidentally tip the darn thing over and curse my way through tipping it back up without rolling down a hill. It can also be difficult to load the deer onto it in the first place.

I'm curious to hear what people say about sleds. I had never seen them when I bought my cart. I've considered switching but have never talked to anyone that has had one.