Thor Super C (Chateau/Four Winds) improvements and mods

I have leveled many times with the front tires lifted off the ground. I was always told never rear tires. Now on I am going to use blocks under front tires and front jacks to help. Have any of you had hydraulic line leaks or problems with your jacks? Service guy told me someone at Thor probably drove over them with a forklift during install...thus the reason some have been swelling? I will know more on Friday.