Bill, prob not what you want to hear but I'll tell you straight up, boondocking off Hwy 1 (the TCH) through "the Prairies" (AB, SK, M
is going to be tough. IDK if you've driven that stretch before but it is
all under cultivation. Seems a lot of folks blast thu the Prairies because they are "flat and boring", etc (they're not but, whatever
) but also in part because camping spots seem to be hard to come by close to the TCH.
One thing to be aware of is that many quiet, small towns have civic campgrounds, sometimes attached to a rec centre (picnics, playing fields, pool with showers) Even hamlets sometimes have them, perhaps as part of grounds for regional tournaments or gatherings. So "sometimes" you can find a CG in the middle of "nowhere" and "sometimes" there is no one else around but you have to make the drive and take the chance.
So, for SK note their "regional parks" (search online). For MB be aware that they have some great Provincial Parks with CGs, at least one not far from the TCH. AB, well it's easier near the mtns and harder the further east you go on #1 but they do sell Taber Corn along there ...
If you want to do some exploring, search out the river valleys.