Just curious, why is it easier to install at 1.0" and 1.75"
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I see the RPG has set heights and an adjustable collar, which one should I get?
Take a quick look at the ICON adjustable collar online and you will see it has an upper and lower component. The upper component is not used for the 1.0 and 1.75, so those two settings are "easier" to install.
While the RPG adjustable collar can be removed and adjusted, it will become more difficult to adjust with time due to dirt and corrosion in the threads. Most people choose the RPG static models because they know how high they want to go. If you are unsure, you will pay more for the adjustable version, and you will have to go through the whole installation process again to adjust them. (ie. Compress the springs, etc.)
If you are planning to go with 37s, I recommend the Geiser progressive springs over any of the perch collar options. Since you live in the Houston area, give Shaun Miller a call at Miller Off Road Design or message him on Facebook for installation services. He can discuss the various options and give you his recommendation based on what you want to achieve.