My Hymer b544 on a Fiat Ducato chassis is in for it's MOT next week so I thought I'd have a look around. Never really think the underside is all that pretty...but wanted to check spare wheel, carrier etc. I was then horrified to find a hole in the rear crossmember. Clearly the design allows water thrown up by the rear wheels to lie in the 'C' section. Looking about over the main chassis showed no concerns with the wax oil of a few years ago still evident and doing it's job. Four bolts hold it on and if it wasn't for the tow bar it would be easy to remove and replace, even if the bolts needed to be ground off. The tow bar makes a difficult job of it and I need to give it some thought. It's clearly not been picked up on previous MOT's having passed with only minor advisories since we've owned the vehicle. Although it all looks pretty grotty, it's only excessively bad in this one spot. Wondering on best course of action.