The only time I wanmt to be using this cart is during my vacation with a FLAT batch of beach sand.

In survival situation ? A bike (even a street type) is much better. At least I can load it up and push it.

Now if this cart was designed with a dual system (pulling system and pedalling system) then it is worth consdering. When it is rough, you can pull it, and when going downhill or on a smooth surface you ride and pedal. That would be nice ... but even then, a 4x4 is going to give more drag than you'd like. It will make you appreciate the work your SUV's engine is doing for you.