The 722.6 trans was used in the E55's of the same era with a lot more torque and HP output than your 606.912.

Of bigger concern would be the type of hitch used.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)