New camper frozen water lines

Yeah I got the water heater when I started winterizing. Forgot to bypass it and ran out of antifreeze. Once I realized why I ran out of antifreeze I bypassed the water heater and drained the antifreeze back out into a bucket and reused it to do the rest of the camper. Between those times though it got down to 9 degrees overnight and by the time I got out of work the next day and tried again the lines were already frozen. At least I know water heater, water pump, kitchen sink, toilet, bathroom sink, and tub faucet are now full of antifreeze. Its the city water connection and the outdoor water spray port that are still froze. My camper has the polar package with the underbelly pan. It looks to me that the lines run under the camper floor in the underbelly pan because I can't see where they go into the wall but looks like they go through the floor. So out of everything I only had antifreeze in the water heater, water pump, and kitchen sink at first but last night I cranked the heat up and ran overnight and this morning before work I was able to get antifreeze into all the bathroom fixtures so the furnace must have heated the lines under the floor enough to thaw. After I got antifreeze through that stuff I shut all faucets and turned pump on to see if it would hold pressure without kicking on and off. It did hold pressure so I believe at least that stuff is leak free. Its just the two outside parts I am worried about now. When I talked to the tech at the dealership today he said it will probably be alright as it has Pex piping in the camper so that should be fine it is just the plastic elbows and stuff that usually break. He said there really shouldn't be any in the rear area just up around the water heater so there are fewer joints.

The camper is new but they water test it before they let them go out because they have had a couple problems before with leaks right from the factory on some entry level models they use to sell. Plus then they could test the water heater also.

It also looks like if I do have a leak somewhere it is pretty easy to take the belly pan off the bottom of the trailer and get to most everything.

Does anyone know do the water lines generally run under the floor on these and not around through the walls?

Thanks