It never hurts to have them. Make sure that you have a tow rope and a chain. If you have good all-terrain tires you shouldn't really have any issues. I have driven all over Kansas (sand/gravel roads)in snow and ice storms in vehicles ranging from a CJ7 to a Mercury Mountaineer to a Dodge Durango. I have always had BF Goodrich All Terrain TA/KO's on my vehicles and have never had any issues with getting stuck. Just drive slow, stay on the crown of the road and don't push your luck with busting drifts. Chains and or tires won't help if you get high centered on a drift. Carry a shovel so you can scoop mud or snow and maybe some ice melt to throw down for traction. As far as weight I just usually used my gear that I was hauling for my weight. Take your time, don't push your luck and you should be just fine.