I am considering putting on some guides to help out. I know the 4c guides are the nicest out there, but they are too expensive for my needs. I'm torn between the kind that are PVC pipes that go on the outside of the pontoons, similar to these:

And the metal "bunk type" that goes inside of the pontoons like these:

Right now I am leaning towards the PVC type. I think the height will help me judge where the ass-end of the trailer precisely is, and they will serve as a guide as I pull out. But I can't ever recall seeing anyone use them on a pontoon, so I am wondering if there is a good reason nobody uses them.
The metal type cost a bit more, but come with 4 so I could have 2 up front too. I am just afraid that I will not be able to see them under water and tear up my pontoons on them.
Someone give me some guidance! Thanks!
Tim