Hi Dee
The bridge you refer to at the beginning is a dam just north of Barragem de Povoa, Portugal. Someone in a wobble box, who came that way, warned us of how tight it was as he'd scraped his going thro! I admit we thought we'd (I'd) made a mistake but we carried on undaunted. The bend in the middle was the worst bit - we had about 1/2" on drivers side and maybe an 1" on the kerbside to play with. What made it even worse was the fact that the wall prevented us from opening the door to get out and watch! We imagine we'll be the only RV'rs to ever venture over it.