Although I can't speak of your model,in my Safari the plumbing follows the outside walls and can be accessed through the cabinetry or behind appliances or under the side gaucho. The drainage is all abs and supply is 1/2" flexible copper-both of which have long service life and unless you have a problem I would leave them alone.The taps can easily be rebuilt with new washers and plumbers grease the 110 V system is behind the interior wall skin,and again if it ain't broke why fix it? Much as i dislike aluminum wiring, it too can mostly be serviced/restored at exposed connections like fuse panels and outlets.
Ken's idea of screws is good but I find screws work loose really easily if you've got an unbalanced wheel assembly , or just because of the road vibtation.I would use some Vulcem or Locktite if I were going that route.
Personally-I had to draw the line on major teardowns when I bought 'Puff.I spent 12 years on an antique car and never really got to enjoy the thing.My policy now is if I can't get it back together before next weekend, it stays that way!I bought this one to enjoy the road- not the garage!