I've been looking at Sand Snakes as a possibility, but what are some other suggestions for some nice paddles? And are 18's ok to run on it with 20's on the front, or should I leave 20's all the way around?

 

20s are alright to leave in the front. its not any different really.

 

go with a bigger tire in the rear for sand not smaller

smaller = less floatation = less traction and more digging in

if anything throw 22's on there

 

All the new generation of molded sand tires are way heavy. Weight is your absolute enemy in the sand! I like the light buffed down Skat-Traks. We run 6-Paddle Edges (V-shaped) in the rear, and Mohawks in the front, on a lightly moded 400.

I run 20" in back and 21" in front. 18" is kind of small...you will be dragging your rear skid all day!