This might be of interest. I'm no expert and others might know more/beter, but I believe that over here (NL/BE/GE) VW uses the distinction 'trendline', 'comfortline' and 'highline' for several models of their vehicles.
I found online, a list of different spec for the trendline, comfortline and the comfortline after 2010 (GP)
Standard equipment California Trendline:
Volkswagen Transporter, self-supporting, fully galvanized.
Tinted glass in cab.
Armrests on front seats.
Front seats with lumbar support.
Front seats rotatable.
Fabric design “La Strada”.
Airbag for driver and passenger.
Power steering.
ABS / EDS / ASR.
Particulate filter (standard from MY 2008, green sticker)
Piezo ignition (from MY 2007)
ESP (Electronic Stability Program).
Handlebar adjustable in height and length.
4 Speakers
2 Rear seat seats.
Table in sliding door (indoor and outdoor use).
Aluminum furniture.
Sliding doors in kitchen unit.
2 burner stove.
Clean water tank 30 ltr.
Holding tank 30 ltr.
Compressor refrigerator, 42 ltr.
Backrest backrest angle adjustable.
Electro-hydraulic lifting roof.
Slatted frame for top bunk (200 x 120cm).
Blackout blinds for windows in residential area.
In-cab clamp curtains for blackout.
Sliding window on the kitchen side (no double glazing).
Second battery.
Additional equipment California Comfortline
Kitchen unit cover made of tempered glass.
Double halogen headlights behind clear glass.
Body-colored bumpers and mirrors.
Body-colored bumper strips.
Front fog lights.
Electric closing aid on tailgate and sliding door.
Electrically operated windows.
Electrically adjustable and heated exterior mirrors.
Central door locking with remote control.
Head and side airbags.
Double-tone horn.
Seat heating in front.
Comfort dashboard in cabin.
Luxury door trim in cabin.
Air conditioning, manually operated.
Parking heater with timer.
Folding table, slidably suspended from kitchen unit.
Third battery.
Fabric beige “Indian Summer” or blue / gray “Scala”.
Foldable rear headrests.
Extras on California Comfortline from model year 2010 (GP)
ESP / ABS / EDS / A
SR with Hillhold
Air conditioning with thermostat control
particulate filter, Euro 5 engine (green sticker)
Fabric design "Crete"
LED lighting in residential area