Hi Dave,
In trying to tell all Logo-Lite past experiences, this is what I found:
1. First installed mine on bumpers, with vehicle "as-is" & they worked.
2. Next, removed Logo-Lites, painted chassis, undercarriage, & bumper braces, & when re-installed they did not work because the paint did not permit the lights to be grounded.
3. Ran ground wire from rear of Logo-Lite's mounting screws to a ground & everything now works great.
4. Also ran Logo-Lite wires & Logo-Lite ground wires through Model A wire looms sold by Model A vendors to protect Logo-Lite wires for the next 80 years from the rear of the Logo-Lites to under the vehicle where protected from the elements.
5. Also provided wire disconnects, (wire connectors & bullet wire ends), where bumper braces meets the chassis so Logo-Lites can be easily disconnected if need be for any reason.
6. If one wants to pull a trailer, two (2) extra Logo-Lites provided on a trailer will not work if one has (6) Logo-Llites connected; however, if one provides (6) Logo-Lites, (i.e., an additional pair on a trailer), & temporarily disconnects the (2) rear Logo-Lites on the vehicle, the (2) Logo-Lites on the trailer, (total of 4), when connected will function.
7. Can one have Logo-Lites on a trailer & not on the rear of the vehicle? My guess, yes, because one can even drive a Model A with no turn signals at all anywhere on a vehicle with vintage hand signals that nobody will recognize today.
8. Each to his own as to what one may want to achieve with turn signals; but, just trying to help with your initial question on what are some recommendations -- I always try to plan ahead to do things once & seem to never want to even find time to do things twice.
Any other information, call Logo-Lites -- they are always friendly & helpful.