I put this list together in reply to a thread on another sub forum & some one suggested that it (along with others) go here.  

Some of the items are detailed in previous posts.

Things that I have done on my 1999 Van but are often standard or commercially available include ..

Feet on corner steadies

Water & waste hose storage under van.

Slide out storage unit on my rather narrow pantry.

Wire storage racks for all of my Corelle crockery

Wire storage for my glass wine glasses & porcelain coffee mugs

Installed LED option to all internal & annex lights as well as turn, tail & break lights

S/steel saddles for attaching guy ropes via snap connectors to awning guy ropes

'Pegs' for holding all common use tools in front boot

Direction air scoop to send more air into bed room from A/C if required

Water tap on A frame

Most of the common Fridge mods

Digital array for Winegard TV antena

A range of holders in the en-suite for towels & toiletry.  Plus others in the bedroom for clothes.

secure hanger rails in clothes cupboards & a belt hook too.

Special secret storage places for valuables & a 'wallet' fixed to the inside of her bedside drawer for SWMBO's rings & watch etc.

A range of common use items like glues, tapes, caulking compound, cable ties, spare wheel bearing, grease, electrical & plumbing bits etc etc, in plastic containers under a lounge seat.

Fishing rods held in clips in a corner of my bedside cupboard (replaces the bazooka on the tug's roof racks).  Hooks & reels under another lounge seat.

Base of bedside cupboards dived into four sections to separate various foldable clothing items.

Handle from bucket attached to the Hayman Reece WDH to make it easy to carry & manipulate.

Dust cover for HR DWH.

Alignment marks on the back window & centre of front of van to aid in hook up.  Of course one of those V guides around the tow ball for when I get it wrong.  Plus a lock for the tow coupling.

WDH lock pins chained to the A frame attachment to prevent loss or mislaying.

 Edit  .. Just thought of a few more ..

Key operated safety chain on van door & disabled the internal slide lock.

Key hooks on LHS just inside the van door.  Lanyards & large name tags on spare keys (spare car key in van & spare van keys in car).  Includes some for CP entry/amenities keys/cards if needed.

Small white board & message pad on RHS just inside the van door.

Edit 2 ...  Just remembered .. magnetic knife holder for my kitchen knives just beside the wall mounted paper towel/glad wrap & Alfoil                 dispenser.

              not forgetting the plastic bag holder inside the under sink door & the hooks in the spice slide out area for all of those                           plastic/silicon kitchen spoons, slices etc.

              Of course all of the shelves are lined with the non slip plastic stuff.  The single electric hotplate, toaster & jug sit permanently               on this sort of matting & never fall of.  But I don't do dirt roads.  I protect wine bottles with lengths of pool noodles.

              Then there is the rail across the 4 seasons hatch over the bed to hang shirts & things to dry or whatever & the fixed bedroom               fan.   A wall 'pocket' for the TV remote on the wall on SWMBO side of the bed ... eye mask on my side.