First thing I would do is get the Tow Max off. Their nick name is Blow Max. Many have went with Sailun 635. The construction in similar to Goodyear G614, all steel, but much cheaper. Some manufactures of heavier units are using them.
Are your slides electric or hydraulic? Bighorns have used hydraulic for several years and a electric drill is used to power the pump. If it is electric usually the crank used for the spare tire carrier is used to crank the slides. Need more information on your rig.