I have one of these. It's a generation 1 Sierra 4x4 trailer. The original Sierra trailers started out in Nevada I believe, then closed their doors before trailers became "cool!"
The blue prints for this trailer were purchased by the current Sierra Trailers who have slightly modified the design to suit their needs.
It's an extremely overbuilt and solid little trailer and quite rare these days. Im in the process of modifying mine by adding a tailgate amongst other things.
Free bump for you, good luck with the sale
"In Omnia Paratus"
80 series Turbo Diesel Toyota 1HD-FT Landcruiser, 5 Speed Manual, Triple Locked, gTurbo, 35" AT's, Metal Tech sliders, custom rear bumper with dual swingouts, Warn 9.5xp, ARB front, OME lift
LV-416 Explorer Trailer, CVT RTT