You are not giving enough info for anyone to help. Are you using a WDH? How many people, and how much gear is also in the truck? What is the hitch weight of the trailer? If truck is not already at its max payload, I don't think the scooter would make that much difference.
If the trucks rear is sagging to the point of having to add air bags, while using a WDH, you may be over loaded already. If this is the case, best not add the scooter. The air bags will not help your RAWR, or tire rating.
Like I said, just not enough info.
Jerry