I replaced my 2011 RT with a 2019. Both have an airbag that you fill with air from under the seat. Both models loose air quickly and I find the bag low on air every week. I’m 175 pounds and ride 1 up only. I put 35 pounds of air in the shock. Why is an air bag needed and why does it loose air so soon? I can go a month on the 3 tires without adding air.