what about a homemade one , you will need a welder , an angle grinder ,electric drill, two 40 inch long by 7 inch of width per 2 inch of depth C type steel angles from a hardware store , 1/4 inch diameter rebars from the local scrap yard the kind that is used for reinforced concrete , cut them in 7 inch sections , also you can do some nice handles with to be instaled in the end of each steel angle , now weld the pieces of rebar every 5 inches over the steel angle straight face so you will have good traction , now with the anle grinder cut any sharp part of the welds so your tires wont be damaged also try to remove every dangerous sharp edge so you wont be harm when trying to use them in a emergency (remember that in cold temps any cut in your skin is very dangerous and will bleed a lot) , also you can drill some holes and bolt them with butterfly bolts to your roof rack and will give you a good 4x4 look :wink:there is also a wood version used by farmers to move tractors when are struck after the rain , are very popular in the jeeperos vehicle (jeeperos = local jeep/offroad freaks very cool people when you are in the middle of nothing they are on 143.880 pirate vhf some of them help on earthquakes very common here ) .