I have used a cart since I started shooting FT. I'm on the 4th one,still tweaking it, but happy. I used a"running stroller" for the base cart. You want a cart with big wheels. I used a atv scabbard to hold the gun. I just cut the top inch or so off the scabbard. This way the gun is pointing down, not up in your face. I shoot hunter, so it makes it easy to move everything on the longer walks. I like having everything I need with me, so it works well. I've been told all it's missing is a coffee maker and electric motor 😎 Not good with pictures, but if you do a search for SMGC, go to the updated calendar for 2017, dated July 9,2017, Twentycal has some nice pictures of my cart.
FYI, I'm half Hungaryian, hence "gypsy wagon"