Supposed to replace black water tank, failed to perform. On Jan. 4 we called Al's to get a quote on replacing the black water tank that had developed a small leak. Talked to Lyle and he said he would send Mike to look at it. Mike lives in Happy Trails where we were staying for 2 months. Told him to call first, but Mike just showed up one day without a call and looked at the problem. Said they would order parts and call with the quote. After several weeks, I tried to call Lyle but when my call was transferred to his phone, it just rang and I hung up after about 5 minutes with no answer. This was repeated at least 3 times over the next month. I called Mike and he said they were having trouble getting the part number from Monaco. I emailed Monaco tech support and had a reply in 12 hours with the part numbers for our tanks. I emailed Mike with the part number and the information for them to open a claim with our extended warranty company. This is now early February and we were leaving at the end of the month. After no word for a week, I tried calling Lyle and again he failed to answer his phone. I called Mike and he said he would be in the shop in a few hours and would call me with the status. He never called. This was a another repeating situation as he NEVER called me after promising to do so. He did stop by on a Saturday and said the part would be in on Monday or Tuesday. I called around Friday when I had heard nothing and again got a promise of a status phone call that never came. A week before our departure from Happy Trails I called Mike and got a lame statement about tracking numbers. We finally left on March 8 and they never called us and never did any work. These people are either totally incompetent or just plain liars. They lied to us for 2 months. We have had work done by Al's shop in Yuma and been very satisfied with their performance but stay far away from the Glendale shop.