How would you implement boat trail?

[slapin]

Hi, all!
I need to implement boat trail something like
https://www.shutterstock.com/image-phot ... s-64126471 but it might be less pronounced and cheap,
but for unlimited number of boats (and without vertex texture fetch and heightmap rendering - I need to go cheap here). Any advice is appreciated. My ideal is GTA VC/SA - like boat trail, but can go for less.