FWIW, I have a hunting cart (I have MS so, I had mine built for my by a very nice fellow in Louisiana. I did a lot of research on carts, and it was less costly for me to have him build my cart and ship it to SW Pa. , than to have one of my local guys build on with the options he put on it.).
Now, some of the options I have are an ALLTRAX AXE4855 CONTROLLER and a D&D HIGH TORQUE MOTOR. The Controller is programmable via your laptop so you can adjust it for either low end torque and less top end speed, or more top end speed and less low end torque, or somewhere in the middle. Mine is set for low end torque. My cart is also a 48-V. I've been using this cart for 2 years now and it's been running like a champ. I use it a lot, so it's not like I use it for 3 or 4 weeks and put it away for the rest of the year.
The limited slip differential (posi traction unit) works really well. I take my unit up (and down) some steep hills here in SW Pa and I've not met a hill that the buggy won't climb. Now....I'm not looking to get stuck, or flip it over either. I keep 'em in reason. But I usually go up and down gas well roads and gas pipelines. I have gotton stuck a few times, but my winch has saved me on those occasions.
So, get the posi-traction rear end, go with the D&D motor....they do just fine. I also have the cart lifted and ATV tires. In the snow I put on chains (front and back) and unless I bottom it out in the snow.....I pretty much go where I want.
I hope this helps.