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My son is 6 years old. I still have him in a 5 point harness in our main car, but don't have an available tether in my husband's car. My question is, is it safer to install another Britax Fronteir 90 and not top tether it OR just use the Britax Parkway Belt Positioning Booster with the seatbelt? My preference would be the 5 point harness but I don't know if it is safe to use it without the top tether...looking for the safest option out of the two.