My first thoughts would be how much do you actually haul your 5er plus how much does it weigh, how long is it, also, at the age of the unit, is it economically justifiable. The Equa Flex will probably suffice for most folks needs while the air suspension may be great for a full timer with a long, heavy, all season 5er that likes to move often. We have the MORryde version of the Equa Flex and it does a fairly good job though probably not as good as if it had the air suspension - but then, I did the math noted above..... :C
