Hmm, that could be a problem
excess luggage means that you have to pass it thru in front of the immigration and customs and they could ask how do you have so much stuff ...to transfer unless you have not been staying in canada.
This is for the bus.
I dont know how it goes for the train, but I assume it must be similar. Cant you get a friends car ? or come back from canada to get your luggage in a canadian car ?