Hey Dan, thanks for reaching out!
According to my research, your 640310CXX1J0 part number is the same as a Penguin II so our Dometic Penguin II High Efficiency RV Air Conditioner # DMC76ZR will work. It does install with bolts coming up from inside as opposed to down from the roof, yes.
As far as shipping goes, we just use the same packaging that Dometic sends the ACs to us in, so it probably will fare about the same as the Amazon packages, if I'm being honest. 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...
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...
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...