You can in fact get a "TPO" roof (thermoplastic polyolefin). It is supposed to be black streak free... I almost bought a kz trailer that had this feature (kz.com - go to the travel trailer brochure and it will be listed near the end with a picture of the trailer construction). I did see a kz trailer last year similar to what I had considered. It too had those dreaded black marks
. I could not say for sure that it had the tpo roof but it was the same spree trailer (different model) that I was considering. I have seen the TPO roofing listed for roof replacement. It is also supposed to be lighter and more durable. Hope this helps.