I lived in Vermont for 60 years... I know about that climate. Many of those years I lived in a mobile home with water lines exposed outside. Heat tapes worked flawlessly. That's all I'm saying! I'm not trying to pick a fight, just pass some information.
You are remembering my suggestion was to a teenage girl, with parents out of town right?
I can't say I've been a mobile home dweller nor my father or has he been contracted to install insulation for mobile homes. I sent a screen shot of this info you supplied to my Dad who spent his entire adult life in the pipe fitting and insulation business. He has had his fair share of experience in burst pipes in -10 to -20 degrees. He is always about best practices for construction and does not favor simple fixes over multi layered good practices. His projects have been for many hospitals, Sears Tower and skyscrapers in Chicago. So here goes.
When you wrap heat tape around a pipe and plug in to a receptacle make sure it is monitored and has a thermostat to control temps. Old versions without have been known to start fires. It can be effective in places like garages and crawlspaces where you cannot get to the pipe to wrap it with proper insulation. He went on to say he never had a project where heat wrap was the designed insulation, more an amateur fix for something that was not designed properly.
His red flag is heat tape only guards where it is wrapped and somewhat close to the heat source in extreme temperatures. So if the pipe goes under a crawl space you can't reach or up a wall you can't access, it may not be guaranteed to always work but it's 100% better than nothing.
Pipes generally do not only fail where you can wrap them with heat tape. Often they burst behind bathroom tile, behind bathroom walls where water does not flow frequently. Another area is in laundry rooms or wet bars again where water flow is not continuous and may not be close enough to the warming areas of heat tape in very extreme weather. He went on to say he can't recommend heat wrap as a solution without knowing how the balance of the house is insulated and how close the pipes are to outside walls. He also was concerned about any method claimed to be flawless, he doesn't know of any construction method, material or product that he can say is flawless as there are too many variables.
While he didn't deal with mobile homes he said they likely very limited piping in comparison to a house or an apartment, adding the odds are water movement in the pipes throughout the mobile unit is more frequent throughout the small piping area and pipes are likely closer to the heat wrap source. He also added the likelihood is mobile home are designed and manufactured with tried and true insulation. Heat wrap added to outside inlets could work well as an added measure given the small footprint of the homes.
He said he stands by his recommendation to keep faucets throughout the home dribbling with a mix of hot and cold water when temperatures become extreme for the region they were build in. Saying that designs for insulation installed in homes vary by climate and by builders notorious for short cuts behind walls. The dribbling of water is a safety net for extreme temperature fluctuation to keep pipes from bursting since warmed water that is constantly moving will not freeze, especially important during the night when water in the pipes are more likely to become stagnant. While not green for a day or two neither is a dumpster filled with damaged construction materials after a pipe bursts.
While he said heat tape is not difficult to install and why it is often used by do it yours-elvers he too was very wary of a teenager installing if they did not have good working knowledge of home repairs.
And that ends today's versions of home ownership. Tonight as temps are going to again drop well below zero. For now I'll enjoy the heat wave of 12 degrees.
You're missing out! 
. Also, I have figured out that the Sophomore slump recurs in college
That picture is old. 
