The lid of a MaxxFan Deluxe like # MA00-07500K is going to sit approximately 15mm (5/8") above the roof of the RV. There can be a bit of difference with this depending on the curvature of the roof so I measured from where the flange would sit when it's fully mounted.
If this doesn't work for your setup then I recommend the MaxxFan Mini Plus Manual RV Roof Vent w/ 12V Fan - LED Light - Black # MA00-03851 in its place since it has no overhang but still has a rain shield cover. I actually... view full answer...
It is a great idea to use the RV Sewer Hose Carrier for fishing poles. You can lock the Valterra RV Sewer Hose Carrier part # A04-5094BK with a padlock using the hole in the lid on the ends of the carrier. The hole measures a little less than 1/4". I recommend to use Master Lock Covered, Solid Body Padlock part # 131D to lock it.
I took a look at your photo and we do not carry a gray water hose storage box that looks like yours. We do carry the Lippert Components Nozzle Enclosure with... view full answer...
I can certainly point you in the right direction. For the rear axle of your 2019 Hymer Aktiv Motorhome, I recommend the SumoSprings # SSR-313-54. These are the 2,800 lb capacity jounce springs. They will replace the factory bump stops and do a great job of leveling your ride, and absorbing shock.
For the front axle, we do not carry any jounce springs, but you can use the SumoSpring coil helpers # CSS-1195F. This is an insert that goes on the factory coil springs. This will help add support... view full answer...