Progressive Shock Difference, again?

[pjandbee]

Greetings from hot, humid and wet N.W. Florida.
My shocks are shot. I've been looking at the Progressive shocks and started wondering what the differences really are from people that use or have used them. I ride solo 99% and pull an Aspen trailer every now and then.
I have been trying to compare the '440' , '418' , '416'air & '412. I've seen a few comments about the '412' and to make sure to get the HD. I've been wondering if the ride justified the upgrade to the '418' & '440'. The air shocks aren't my first choice.
I call my self trying to find any info that would help me but to no avail, so I'll bother you guys, again,

I had to change my bad ignition switch and decided to change the location while under the tank. Old/bad switch = extra harness length. This turned out to be easier than trying to pull the harness to reach the new location. Relocated to the side cover and loving it.