I just put a second 12V outlet in my 745t ('90) in the footwell by the driver.
*(See below if you are interested it was easy.)

Now I want to run it back to the wayback - the door sills are the obvious route **but what about getting through the second seat and trim of the cargo area**? Ive seen a posting of how to remove that left side (my working side) panel and it sounds like a royale pain....

Any suggestions?

*(I did it by running a new power line off the POS + terminal and through the handy grommet my favorite Swedes put behind the left strut tower on the firewall. I got the lead at the parts store alredy rigged up with a ring terminal and a bladed fuse terminal (like a '90 745's fuses) within 3 inches of the start of the lead. This approcah leaves the original wirning harness intact, but is however unswitched. Search Brickboard for "12V socket" also for prior discussions.)