Welcome to the forum.
For a manual, go to the front page of this forum, scroll down the the "LIBRARY" section and you'll find a couple of buttons there..one for Owner's Manual and another for Brochures. If you don't find a 1999, just look for a nearby year.
To find the converter, locate the shore power plug on the exterior of the trailer. The converter will be inside the trailer, usually close to the shore power plug. It will always be accessible (to varying degrees) so you can change fuses and breakers, and replace the converter when it reaches the end of its useful life. You've only got about 200 square feet of floor space in the Hi-Lo, and the converter will always be in the lower half.....you can find it, I know you can!!
Others have done most of the mods you mention, and you can find posts about those by using the search button.
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