Where in Canada?
I am unsure of the procedure in other provinces, but here in Ontario, the seller will have to provide you with a UVIP (Used Vehicle Information Package). This provides you with vehicle history that contains essential information like registration history, outstanding liens, and recorded odometer readings. A CarFax or similar report can provide accident history.
As well, if we are talking about a motorhome, the vehicle has to pass a Safety Inspection at an approved shop, to certify its road worthiness, before it can be transferred to a new owner.