You say new rv. Are you new to rving?
There are some things you can do that can help.
Are you in full sun? Even partial shade will make a difference, See if you can move to a shaded site.
Insulate your roof vents and skylights. Use of pillows for the 14 x 14 vent openings as well as the 14x22 in most showers help
vent pillowsSituate your rv so the west side exposure is the passenger side so your awning will shade the side toward the sun in the afternoon.
These are quick items that may help, otherwise, do what rv'ers do. Go north and up in the summer months, go back to Texas in the winter.