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1st congratulations on the new camper.
Hopefully you have good insurance, as you might need it. In reality it is hard to say at this point. The previous owner might have drained the system, or even winterized it for you.
The tanks being empty is a good thing. Was the water heater empty? If not it will be damaged. The water lines are made of PEX, which should hold up to the expansion of the freezing water. However, the pex pipe fittings don't like frozen water in them, and will break.
For now, sit back and have a beer. In the spring, keep an eye on it.
Do you have an air compressor? If so, when it thaws, connect the compressor to the City water connection with a pressure gauge and a shutoff valve, set the pressure regulator to no more than 40 psi. Open the faucets and low point drains, pressurize the system, and flush any water out. There is always some residual water, so do not freak out. Next close the faucets, and low point drains. Pressurize the system, have a pressure gauge between the Compressor connection and the camper, shut off the air, with a shutoff valve and isolate the TT. If the pressure drops, more than 1 psi in 24 hours you most likely have a leak. Air can escape really quickly from a small leak.
Most of the test fittings you can get in the plumbing section of a major hardware store, a male hose to male air compressor fitting. I use a garden hose shutoff valve, as it has the right threads. As for a pressure gauge, you will have to make up your own fitting, as most fitting are setup for traditional pipe fittings and not hose threads.
If the pipes where full of water, the most expensive damage was to the water heater. the rest of the items will be labor to replace the pex fittings. Also the water pump has a small filter screen bowl that might have cracked, and you'll have to replace it too.
Good luck, please keep us updated.
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