This is almost like asking what engine oil should I use!    Long enough to reach.  I think my fresh water hose is 25'.  It has been long enough, so far. 

If you wish, you can buy a cheap light garden hose for the black tank flush.  i built an adapter with a check valve in it and an 8" length of garden hose.  I use it with any old hose to flush the black tank. 

My 180 has only 1 gas shut off valve, at the tank. 

I will recommend a battery cut-off switch.  There is enough stuff in the trailer that pulls power to kill the battery in 2 weeks, or so.  A few cloudy days and my 25 watt solar panel can't save it, either. 

Greetings,

+1 to OG and StephenH responses above.

After owning a 177 for 10 years, our choice for the black tank flush hose is a ten footer.  Been in many different types of campgrounds and have never needed anything longer than 10' which is easier to store anyway vs. something much longer.

The only time our propane valve is turned off is when we switch tanks, otherwise it is always left on.

Welcome to the forum and enjoy your 180!

First, the only propane shut-off valves we have on our 2016 RP179 are on the tanks. (I have two installed). There is no separate valve. I don't know if the newer ones with the low-pressure connection for a grill have a valve, but that would only be for that connection. To shut all off, it would still be at the tank.

What length hose? The biggest one that will fit in your carrier. 10 foot is minimum. 15 foot would be better if it will fit. anything longer would be unlikely to fit. The original carrier we had would barely fit 10 foot. The one I built will hold 20 easily. As for fresh water, 25 foot would probably be sufficient. Make sure it states on the label that it is drinking water safe. It may be white or blue, but not the typical garden hose green. As for black tank flush hose, don't use your drinking water hose for that. Again, 25 foot should be sufficient. If you use a biological treatment, that will help with the breakdown of solids in the black tank. Don't use any treatment with formaldehyde.

Hello you all,

I'm Steve and we have a new 180 that we haven't traveled with yet.  So, many questions.  First, are there propane shutoff valves for the frig and the furnace, or just the shutoff on the tank itself?  We will probably dry camp for our first trip to visit our old Auntie and Uncle.  So I won't have any immediate questions about plumbing.  But, what length fresh water and black water holding tank flush hoses should we buy?

Thanks much.