LA is a big spreadout area. Most folks want to see:
Hollywood (Chinese Theater,Hollywood & Vine, Stars Homes...etc) A few miles north of downtown LA
Downtown LA historic sites like Olvera Street,Union Station, Angel's Flight...
Universal Studios or other studio tours (several miles north of LA)
Venice Beach (several miles south & west of downtown)
Ocean & Beaches
Museums
Disneyland (about 30 miles south of Downtown LA)
and more
You may be able to find one tour for all of these areas or several tours to see each venue.
Public transportation is available but not always convenient to some of these.
Driving a TC around LA can be an adventure in itself. Traffic, parking, obstructions, theft all come into play.
My choice would be to setup camp in an RV Resort near LA (Frank Bonelli Regional Park, Fairplex KOA or one of the parks near Disneyland) then rent a car to tour the venues where tours aren't available.
To beat the traffic do as much as you can during the weekend, the venues may be croweded but traffic will be good. During the week days plan on waiting until 9am before venturing out and returning to camp by 2pm. This will avoid the rush hour traffic. Or leave before 6am and head back after 6pm. During rush hour it often takes an hour to 90 minutes just to go 30 miles.