Wet ground shouldn't be too bad. Puddles, stay away from the deeper ones, and when you're done make sure you dry everything off real good. I ran my Speed-NT through some one inch deep puddles, and the only problem I had was the battery box (behind the rear end) filled with water. I ran my Savage in an inch of water, with no negative results, but it wasn't alot, and I checked it over real good after. Spray isn't going to be too bad, as long as you don't submerse it.
Straight runs will keep the front tires from rooster tailing the water under the body. When you turn, you'll shoot water up underneath the body.