Hi. I’m very inexperienced with cars and 4 x 4. I have just purchased a 2015 bt50 4x4 privately. Its had all its service history, average kilometres and from the outside it looks good. However a friend of mine looked under it today and pointed out this rust as pictured. I’m worried I’ve made a huge mistake and this will be a major issue down the track. What are your thoughts? Should I get it rust proofed? Is it too late?