Are you sure they are HWH? I had a 96 Itasca and I am sure the rods were stainless steel. My 2000 Discovery are Power Gear. I had to replace the right front jack several years ago and there is, or was a rebuild kit. Mine had corrosion on the hyd. rod which rendered it scrap. It was a better deal to just buy the whole thing new. Not cheap!! My problem was that the design of those jacks left an area about 3/8 in. between the seal and the end of the tube where salt and dirt could collect. Then when the jack is run up and down it tears up the seal. The newer one I got from the factory had a dust seal at the end of the tube and a grease fitting on the side to keep this area clean. Don't know why but my rear jacks came this way. They told me to apply Lithium base grease (reg. auto grease would damage the seals) to the rods when they were extended so it would deposit around the seals when retracted.