Indeed, this mini-built-in-storage-tube for our sewer hose is not the idea of a Trait-Lite genius who has camped a lot!!! I measured it : it is exactly 1 foot long ! They could at least have added a foot : there was space for that.
To correct this stupidity, I cut the end of the foot-long tube, bought myself at Home Depot a 6 foot-long flexible aluminum tube (4 inch type) used for the standard clothes dryers. I slipped it gently over the midget tube, taped it firmly and had the rest of the tube make a natural curve towards and along the B+ chassis. Before fixing the whole thing and in order to close the new tube, I taped also the short vinyl piece (previously cut) at the end of the aluminum tube. Last precaution, I punctured the tube a few times to allow the inevitable water to leak out but I am not sure this is necessary. The addition holds now solidly in place with a few plastic attachments and can now receive a 20 foot hose sold at Wal-Mart... instead of the 6 foot one my dealer had equipped our rig (model 251) with!
And it has worked well since then.