"I would love to be able to re-plumb my Reflection trailer because my sink in the bathroom is literally 2 feet from my hot water heater and it takes over a minute running hot water to get to the sink! Shower is 6 feet away and takes almost a minute and a half!" Others have already had the coroplast down and can tell you what it actually looks like in the belly, but I think that almost everything has to run through the Nautilus system. I know there are at least three different color hoses running around there.
Normally, hot water lines run from the hot water heater to the farthest faucet, with closer ones being fed by a line that comes from a T fitting. In our case, therefore, the hot water line should run from the hot water heater to the kitchen sink, with lines coming off of that main line for the external faucet, the bathroom sink, and the shower. Since both bathroom faucets are within a few feet of the hot water heater, I should get hot water (well, at least warm) within a few seconds. It takes far longer than that.
I use an electric teapot and a two-cup pitcher in the microwave to get the water in the kitchen sink hot enough to wash dishes. I fill the teapot using "hot" water, start it, then fill the pitcher with "hot" water, start it in the microwave, then rinse the sinks with the faucet on full hot. When it starts getting fairly warm I put the drain plugs in and start filling the sinks. Meanwhile, the two electric devices are getting the water close to boiling. As soon as one is ready I put it into the wash side, with the second one going into the rinse side.