As Carol said plus -
We brought a Casita
over the border to BC from Idaho in March this year.
Process is super easy - main things to make sure are that the title
and the vin
number on the trailer match. You also want to make sure it has the sticker of compliance that usually lists the gross weight
etc. Do up a bill of sale (examples on internet) and also keep copy of ad you saw initially - they sometimes want to check at border that you paid close to what it was advertised for. Just arrive at border don't need to call ahead.
In Washington you get a 3 day permit - around $30, so just check at the local motor vehicle office in the state you are buying it. Idaho when we checked said you had 3 days to get home and didn't need one but we bought our Casita from a dealer and they gave us a 30 day permit.
In BC you can fax your insurance company (from location you are purchasing it) the title
etc and purchase insurance from them but it is only valid once you reach BC (not sure in your province) and only if your trailer detaches from vehicle. Otherwise it is covered on your vehicle insurance.
If trailer is older than 15 years you don't pay the RIV or need to get it inspected but you still get the Form 1 from border to take to insurance..
Call RIV and double check but we didn't need the recall clearance letter even though it said on the site we did - when I called they said they have stopped needing it for trailers.
We paid the GST at the border and the PST when registered it.
You get the form 1 at the border that you then can transfer info to online on RIV website plus your payment - around $220 and they process it really quick - same day (don't work on weekends and stats though) they then email you the inspection form you take for the RIV inspection (ours is just a small garage in town) larger centres seem to be Canadian tire.
Call them and make an appt, take trailer there plus your form, they do a minimal inspection - ours seems to just check the VIN
and write down the type of tires
, stamp it and you can take the trailer and get registered and insured. Insurance place will also want to see trailer and check VIN
It's a super easy process and the folks at RIV are super pleasant. PM me if you have more questions or want to call me.