OK, I know it's not the ISS because it rattles away and has not been fixed with different clamps etc. When I decelerate from around 60 mph I get a decelerating thumping sound in the floor boards/front end. It is a dull sound and will thump about 8 times while I slow down. I can actually hear it in the cab. It seems to do it more often following a slight right hand corner. Not necessarily a sharp corner, just a slight turn in the road. It will also do it on the straights at a constant speed but less often. I do feel some thumping in the steering wheel but is more of thumping in the floor.

Any ideas?

Anyone with any ideas? We are heading out in one week for three weeks of holidays and I would hate to get stuck with the camper and boat on the side of the road.

Solved - Front left wheel bearing. Did both sides and all is good.