I have been a mechanic most of my life and I almost never change the oil in our car or excursion. The shop a few mile from home does it for not much more then I would pay for the stuff. I can watch and look under it when it's on the lift and it makes me a regular. I can borrow special tools from them when I do all my own repairs. The coffee is free. When we were away once, one of our kids called and wanted me to fix her car and didn't know we were away. I sent here there and they fixed her up and said "your dad is a regular customer so don't worry about it" that is worth something.
We never make reservations but after driving 8 or more hrs. when we want to stop we will call ahead before we get off the hiway. Most all the parks in the middle of nowhere and near the hiway are geared for the quick in and out pull thru.
It is against the law to have them on unless your stoped in many states. If on the interstate and you see a sigh that says to use your 4ways at less then ?? MPH the speed on the sigh is your answer for that location.
For years for had these colors in the steering column
white/blue R,F. Turn
green/white L.F. Turn
orange/blue R.R. Turn and brake
green/orange L.R Turn
Check with a test light first but that will give you a place to try