Potty Problems

We have a female Maltipoo who was one year old in Feb.  She has never been consistent in her training but had finally gotten where we trusted her after we installed a doggy door for her.  We spend  almost five months of the year in our travel trailer at the campground which my husband manages every summer.  This is where we lived when we first got her but she was over a year old before we moved back into it again.  There is no doggy door but my husband did provide a fenced yard for her in front of our trailer.  She asks to go outside several times a day.  She also urinates in the bathtub so we keep the bathroom door open and reward her when she goes outside or in the tub.  She will still urinate on the floor, mainly in my bedroom.  We keep a gate across that entrance so she has started going on the living room carpet.  I clean every spot as thoroughly as possible and she doesn't use the same spot but will use the same general area.  It is driving me crazy.  Any advice?  I feel like I have tried everything.