Wow! Quite a process... congrats!
Are you planning to have a heat source of some kind under the trailer for use in especially brutal cold weather? The most vulnerable point will be the drain valves, of course...
If you let your holding tanks get nearly full before you drain them rather than leaving them open all the time — which is the recommended procedure to prevent solids from building up in the black tank — you will want them operable at all times...especially when it's time to drain. If the part outside the underbelly freezes, it may be difficult to drain your tanks...especially is day-time temps don't allow for thawing....just something to think about.
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TB & Greg and Abbey Schnauzer
AirForums #21900
PastPrez, 4CU/WBCCI
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