Ask the dealer to supply you with a direct feed connection. Maybe if something by some remote chance goes go wrong, they cannot blame you.
We have been using direct feed for the last 12 years with no issue as they came standard with the caravan. Prior to that we bought one from Whale for our Lexon 640 which we only used occasionally with no issues.
Makes life a whole lot simpler. Just don't turn on the tap full blast. Let it trickle feed the onboard tank. If no onboard tank, then perhaps float system is better as the pump will give you the internal pressure needed for showering otherwise trying to get correct pressure for showering can be a bit fiddlesome and daunting.