We had ours installed in Austell a month or so ago.
It's amazing. We have been in strong winds with stronger gusts. It was very easy to maintain the coach and keep it within the lines.
Why don't they install these from the factor? In my opinion it's like every decision made... COST.
Yes, it's not like $500 is going to break the bank, but if you add all these personal touches people like to do (such as; spare tires, safe T plus, Sumo springs, window tints, etc.) you're quickly adding on thousands for an entry level Class A. The lower price point drives interest and ultimately sells product. That's the bottom line.
Jolly
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