All three will tow a trailer, but do you need to climb hills? The Dost and Trek models will be better at that than the Priority Current which started out using the excellent Enviolo CVT but then switched to the less useful Nexus Inter-5 IGH which lacks low gear range. The Dost Kope has a throttle and I’ve found that helpful on my DIY ebike when towing a trailer or a WeeHoo to get going from stationary. But the Trek Allant is almost 10lb lighter weight and uses the excellent Bosch Performance speed motor with torque pedal assist, certainly worth a test ride.