hi been out in my landrover tonight to pick up a dumper so about 2.5 ton with trailer and noticed a massive dash board shaking vibration when i change into 3rd 4th and 5th and put a load on. I got underneath to check rear prop donut that seems fine, dual mass and clutch replaced 20k ago but i have a wallet panicking feeling the dmf has failed again i tow maximum weight 80% of the time any ideas ?