The consensus on the GD forum seems to be that the Westlake load range G tires are acceptable. There seems to have been more problems with the load range E Westlakes.
Within 2 weeks of taking delivery of my GD Reflection 28BH, one of my Westlakes load range E tires developed a split in the sidewall.
As that was right before we were to embark on our inaugural 70 day summer trip, I decided to replace them with Sailun Load Range G ST tires. These are 110 psi tires instead of 80 psi. They require that a metal valve stem be used instead of the rubber stems with the OEM tires.
So far we are 2 weeks into our trip, having travelled 2500 miles. So far so good. With our tire monitor, pressures are in the mid-90 psi range and temps are generally well below 100F.