I have a 2016 Softail Slim S with a Frankenstein Kit. It is a straight axle and I have had 7000 trouble free miles on the kit. I love the look of the Frankenstein kits with the fat wheels. The straight axle gives a stiffer ride but I wouldn't have it any other way due to the handling characteristics and simplicity of the design. This will take corners like it is on a rail. If I had to start over I would buy Frankenstein again.
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Steve that is one good looking trike you have, sounds like you really like it.
Good job on the conversion.
Ronnie