We are new to this 5th wheel and are wanting some winter adventure. With outside winter temps running around 40-45 degrees days, 20-25 degrees nights, and having 30# propane bottles, how long will we likely go on these two tanks if we do some winter camping without hookups? We would try to be reasonably conservative, but do not want to be uncomfortable? I just don't know it two small tanks like this make it worth heading out.