Something is making my Cascadia move at night when i'm in sleeper

Ok Guys,

Back again. This time, I haven't the slightest clue what is going on with my truck when it comes to this issue. Just to recap, i just bought the truck last December so I'm just figuring out how she runs and operates. But one thing is surely bizzare. At night when i'm in the sleeper it happens. Something moves the trucks forward as if someone has bumped the whole truck while parking. It happens at random times, after I turn my truck off and set the air brakes, it happens with the trailer and without. The entire truck jolts, not by much but just enough so you can feel the shift. It happens for a split second, all the while making my heart skip a beat. When it first happened to me i ran outside my truck to see who hit my truck, but to my amazement no one was there. Any thought on what this might be?

 

thank you guys so much!! i will address this to the mechanic tomorrow.

 

its at the dealer, so i'll let them know about it. hopefully they can get the diag and repair in before friday, ive been down since early last week.

 

ok so the dealer checked it out. they used a spray bottle to check for leaks (i could have done that lol) and they said they found no leaks. so they kept it overnight to see if the airbags lost any air, and in the morning they said everything checked out fine. so, i'm thinking they prolly didn't check it properly or could it be something else.