I tried EZE gutters once. Didn't work very well. Anything more than a light rain would overflow the gutter and run down the side wall. I did use a length above the windshield that helps keep run off coming off the front cap and helps keep the glass a bit cleaner.
Got lucky and found a local RV dealer that had a supplier that would sell gutters individually rather than by the lot. The boas was they would also cut the standard 16' lengths in half to save on shipping. 16' has to go freight due to the size. One of the better upgrades I made. No more sidewall stains from run off.
2006 Hurricane 31D built on a 2006 Ford F53