I would check with DOT before dumping any money into changing or adding more SAFETY lights.
There is DOT regulation laws at play here if the RV is going to used on the PUBLIC roadways. Even the lens covers of these safety lights have to meet DOT regulations... DOT also has regulations laws on how many lights can be ON at the same time including how they may be turned ON - i.e. manual or in conjunction with other lights etc...
Being an OFF-ROAD enthusiast I have gone down this road a couple of times and all went well until I had to go for my Annual DOT SAFETY Inspection... I had to remove some of these items before I could be passed for my safety inspection.
Not against doing any of these changes just saying check with DOT before you add some expensive lights. It may not be approved to do so.
Roy Ken