Bottom line.... It's illegal (and unsafe) in CA (and most other states) to tow a trailer that heavy without trailer brakes
working. Any decent RV shop can install a controller on your friends truck in a manner so that you can easily remove it for your own TV.
Year ago, with my late wife driving our 4wd Blazer pulling a 25' Airstream across Utah, a semi passed us fast enough and close enough to start the trailer swaying. She hit the service brakes
first (Trailer brakes were manual back then) and that not ony made matters worse, it cause the entire rig to swap ends in the middle of a freeway at 55 MPH, a real E-ticket ride if ever there was one. We stopped facing south, in the northbound lanes.
Ruined all of the tires
on both TV and trailer, tossed everything inside all over the place, but no injuries.
BTW: She never drove with the trailer hitched again, and we were only a month into a 10 month long tour..
Nuff Said ???