Yes a snatch block (pulley) is essential...it doubles your pulling power and depending on how much cable you have 2 snatch blocks could be in order and quadruple your pulling power, especially if you are traveling alone...if you are running with a group then 1 snatch block would be plenty...you have atv'd until you have your machine buried in a mud bog and when you get off to get it unstuck you are in mud up to your knees....enjoy!
PS: been there done that LMAO