My ACE 2017 29.3 takes 28" blades. I wanted to get a better over lap by adding a few inches to the passengers side. I went to O Reillys for new blades. Trico makes special RV blades, I was able to get new 28" and 32" blades. The standard blade will not work on the MH as the wiper arm is wider than a cars standard arm. The cost was about $35 per wiper.
Retired and never looked back