As I have learned when hunting with my camper, wind is the biggest issue. There is a reason they skirt everything.
If you can keep the wind out you stand a much better chance of the pipes not freezing.
Having those lights on all the time would scare me. Can you get some milk heaters? Something that is made to do what you are asking it to do.
Something like this:
https://www.acehardware.com/departments/heating-and-cooling/heaters/space-heaters/6167118?store=03279&gclid=CjwKCAiA65iBBhB-EiwAW253W6ASXkaIOS5nyTqAI1EkmMQoLnjs0OH3k6G4tTOqYN mlZQ5E1kOdahoCk64QAvD_BwE&gclsrc=aw.ds