Thanks for the info. EsoxLucius.. My in-laws have a Unity U24IB with the sumosprings. Like you they are really pleased with the upgrade. Not sure if they also did the shocks. Have fun in Alaska, I was raised there.
j-d ... I was looking for the front springs which are a jounce kit. A bolt on replacement for the bump stop. Also looked at the back which is kind of like a airbag without airpump. Haven't really needed the sumosprings but may think about it if mountain driving would be very much improved.
Thanks again for your feedback.