hi all. taking my 05 prius to the snow in june. winter tyres not an option for a one week trip. chains are mandatory to enter the national park. can they be fitted to the prius , and do they work/ defeat the traction control problem?*( i have had a bad experience on loose gravel where the car would not move.) thanks for any advice. ps : looking forward to the 2000k drive and trying to beat my previous record of 4.3 l/100k over 1000k .