Believe me, they aren't at all ashamed of substandard work. Remember, they ship with empty tanks so the tanks weigh NOTHING and plumbers straps work fine.
What I'm amazed about is, there isn't more electric issues with RV's. They do the wiring to (maybe) residential standards, using residential fixtures and connectors. Problem with that is, an RV is in a continuous 'earthquake' as you go down the fine roads that America is festooned with.
Don't think any mass RV builder knows what a Molex connector is or vibration resistant fixtures. The wiring is all point to point with little (if any) consideration for vibration or external forces that an RV encounters every day it's in use, that a residence never encounters unless it's in an earthquake or Hurricane.