Border crossing Colombia to Ecuador - Ipiales / Tulcan
 

Colombian Site:
Border Crossing had been easy - park on the right immediately when you see the border - stamp in the passport - and stamp on the vehicle import sheet.
Took 10 mins - no costs

Ecuador is easy as well.
Cross the bridge - turn hard left immediately after the police, military checkpoint (there is immigration)
i about 10 mins - fill out the form - get a machine print in the passport.
Go to the Aduana at the back of the immigration (direction to Ecuador - if you don't find it ask - very friendly people)
Vehicle import took some time and some copies had been necessary (vehicle title, driver license, passport, ecuador migration print in passport - all 1x)
Took 1hour 15 mins - no costs except the copies

All in all nice and easy.
Total costs: 0
Total time: ~1,5h