front end chugging/bounceing in soft sand

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lately when i have been going out on my fortnightly camping expeditions i have been having trouble with the front end in the soft sand.
all goes ok until it gets a little more boggy then instead of the front end helping pull through it, it starts to chugg and bounce in the sand which ends up just digging a hole.
i know my idler arm is worn and needs to be replaced (saving for it), but i didnt think it would cause this type of problem.

there is some in/out movement of my drive shafts into the front hubs, should there be any movement like that there?

thanks for any ideas of my problem, as i like being the one that can get more places than my mates. Smile