Kodiak Sidewinder step
We have used this for 3.5 years so far.

Problems: last month, drive gear on drivers side was worn, I pulled the cover and flipped the gear.  With some machining I can flip it  2 more times. 

Update: the control box on the passenger side has died, the replacement is $47 from Kodiak. 
Lets see here 4 years of opening and closing the door...
$12 per year, $1 per month, 3 cents a day...or probably about 1 penny per use.

Other than that, no problems.
                                                            Kodiak Web Page
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Installation Pictures.
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