Nice setup dazlog the 1600 have an inherent weakness with the rear prop shaft spline shearing when towing heavy weight it's good practice to put her in four wheel drive when she's under heavy load, also the rear diff can get hot when towing heavy loads agian 4x4 change your diff oil regularly or even better fill with sintranz allways check hub and diff temperatures when working hard if you can not keep your hand on it ! It's to hot.
Moose