You won't have any problems driving your rig on the Icefields Parkway. Excellent scenery, many observation points.
Fuel, can you go 180 miles (288 Kms) on your tank of fuel?
Columbia Icefields.
Besure to stop here, lots of big rig parking, another favourite of ours is Peyto Lake and the Athabaska Falls areas
When you programmed your Garmin, did you have it programmed to trucks (it thinks COMMERCIAL trucks) which are NOT permitted on the Icefields Parkway. RVs are very common.
Ken
2006 Winnebago Outlook 29B E-450.
2012 Honda CR-V AWD
Blue Ox Aventa LX tow bar and Brake Buddy Vantage.