Removing Underpinning

[Lydia]

We have a 2005 Grand Surveyor, with the totally enclosed underpinning. We need to get in there to work on the bathroom plumbing. Would appreciate advice on removing and replacing the underpinning.

[SeaDog]

If you are only working on the plumbing in one area you may find it easier and faster to just cut the coroplast in a "U" shape to gain access and when the work is complete refasten it with foil tape. Make the attached portion of the "U" is facing forward.

[ependydad]

But, to drop the underbelly... it’s either screwed in place or they’ve also been known to use some kind of expanding nails.

If it’s the former, just unscrew all 7,000 of them to get access that you need.

If it’s the nails, just start worshipping Satan.