Since about the past 10 days or so, I hear a thump easch time I hit a bump. The thump sounds as if its coming form the inside. It seems like its coming from either the rear door , or from the rear seats which are always in the down position. I checked to see if the spare was loose, but it seems tight to me, & the door is also tight when its opened. I even tried driving w/ the rear seats in the up position,but still I get the thump. The sound appears to be coming from the rear on the passenger side. Does anyone possibly know what this is?..thanks Bruce......PS I cant wait till I have the PV2 installed this week!