I have had flexible extenders on several motorhomes with zero issues. But... i just had the Michelin recall done (Feb.) and found both inner tires flat one morning post the new tires being installed. I figured they were just poorly installed and really put the pliers onto them. One has held air but the other one has subsequently gone flat again. I have ordered new more expensive extenders to see how they work. It is a real pain without them so need to install something.