Pat,
I feel like I know you having read 3 years of your life in 40 pages of tips and tricks.
I am stuck, mentally.  I have an ambo box, on wherls, ready to outfit.  I was told by the previous owner, repeatedly, that the box weighed 1400 pounds.  I thought with a trailer under it, 2,000.  I'm guessing it is actually more like 4,500 or 5,000 based on how it tows behind my 4 cylinder toyota T100.  I tows just fine, but 50 is comfortable, 40 up hills in 3rd gear.  So, without being able to use it for long haul motorcycle trips as intended, I am kinda stuck not knowing to keep, sell, outfit, etc...
I started my ambo build in January 2018.  I've put about 50 hours in it and am having a blast.  I have it on a 7500 pound trailer axle with electric brakes and old 5 bolt rims.  The trailer is a tee, with 3 by 5" longways and 3 by 3 crossmembers that locate the leaf springs about where the inboard dually wheels were.  I can run low or high by moving the axle over or under, with dual spring perches on the top and bottom of the axle. I have a 36" long rail extension on the front.  4 wheeler, motorcycle, or generator / propane?  Wish I'd read your thread earlier and made it 60 inches....
I tracked down all the ambo wiring and consolidated to 10 relays, 1 master with 9 20 amps for the 6 ambo still used and some extras.  Aligned fuses and wiring order with relays 1 to 10.  Have a rv shore power 120v relay, battery charger to run all 12v when plugged in, a relay to use taillights on tow rig to charge 12v batts, and a small 600 watt inverter for 3 interior outlets when on batt power.
A/c and heat pump are dometic 120v and work well now.
Everything works as designed with 10 led lit switches inside.  Finally.  That took a solid 20 hours to get a mental grasp of and sort it out. I wasn't so lucky as you, the ambo chassis has been chopped off months. before I first saw it.
I gutted the inside.  Cleaned all cabinets.  Now ready to outfit it.  And that is where my mental capabilities end...I'm stuck.  I thought it would make a great mobile construction office / basic camper.  Paint?  Camo?  Leave as is?
Inspiration is needed!