hi all ,a question which might be an easy one to answer,my landy with trailer connected,trying to tow a large estate car with another car on a trailer up a short steepish ice covered hill,i put the diff lock on ,in low box managed to move them enough for them to sort out their mis hap .[ their trailer was not lined up for the hill after a number of failed attempts ] I was wondering is it possible for all the power to go to one wheel,on thick ice,even when diff locks engaged? I looked at my wheels at the time and only one was actually driving . was i being too demanding of poor old landy?