RV backup cameras and proximity project

First - if this is in the wrong category please let me know...

I'm wondering if anyone has done anything like this. Maybe I'll buy something off the shelf. I have an older rv which lacks parking sensors and cameras. There are add-ons that do some of what I want but nothing perfect.

I'd like to add cameras that show the sides, front and read and also have an overlay for distance...
I like to have something along the sides to warn me if I'm close to something - the back tail can swing and it's nasty leaving a gas station. When you drive an RV - you visit those more than you'd like.

Any ideas?

Probably best to get off-the-shelf solutions. Easiest, at least.
What don't they do what you want them to do? What you list sounds pretty standard.
How about mirrors to keep an eye on your tail?