1. - sure, if you have the spacer as well.
2. - assuming horizontal dropouts - check your frame is in straight, assuming vertical dropouts - check your rd hanger is straight
3. - a set of weights etc. that should be able to to get true slope calibration, not just spindown of th weighted flywheel.

Where to buy?

Will be setting up my Wahoo as soon as I type this.

Curious why #3 matters. I had been training with a PT and TR, but my indoor FTP and outdoor FTP were always upwards of 10% difference anyway. I was thinking as long as the kickr is consistent it wouldn't matter. I am thinking about that incorrectly?

If your bike shifts fine off the trainer, but has some chatter on the trainer, then offset the spacing of the freehub body on the Wahoo differs ever so slightly from your rear wheel. We had this issue with our Tacx trainers due to minor differences in the offset of Zipp 303 freehub body on our road wheels and that of the Mavic Aksium wheel used on the trainer. My solution was to use American Classic's 1mm cassette 'shim' on the Mavic freehub which brought the spacing as close as possible.

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I've got about 5-6 years of data w my SRM and use that outdoors so if I'm going off the wahoo all winter long my FTP might be let's say 270 in March but w the srm it's really 250 and therefore not consistent when I move from the basement to outdoors.

Of course if I know all that I can just do the math and realize and take that into consideration.

It would just be nice to have them close as power is power.

hey i have the same issue also with the srm and wahoo. let me know if you ever find an answer otherwise I will just do the math and if my FTP goes up use the ratio to assume what it would be outside (and then of course test it next year!!)
can not wait till trainerroad app is out hopefully this week

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I use what I love: ISM, Blue70, Trek, FLO