The 2011 Springdale 291 - East or West coast - designs are almost identical in size and weight and the stock tires should be ST225/75R15D. Your GAWR for that trailer is 8700#/8800# depending on coastal design. So at full load you will still have a nice total tire reserve load capacity of 1360# at 65 psi. If you have taken good care of those tires there is no reason they should not make the trip to Texas. Keep them aired, check them at every stop for excessive heat and drive 65 MPH or less. Have a safe and fun trip.