Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to transport a horse [title] Set up the trailer. [step] Make sure that your trailer is correctly fitted and secured to your towing vehicle is well suited to towing the weight. Run a total safety check, including brake lights, tire pressure and the amount of gas in your tank.

Ending1: Make sure that a cell phone, horse's legal and medical documents and a map or directions are in the towing vehicle. Always be prepared for problems that might occur. Ending2: [title] Talk to your towing company, if they allow this. [step] Remind them of their policies on towing their horses. Ending3: Make sure that your vehicle is not too hot before you begin towing the weight. [substeps] If you have a spare deck door, then use it to set up the trailer and also to waterproof the deck door. Ending4: Make sure to clamp the bed rails of the trailer. [title] Place your horses trailer on its side.

Answer format: ending1/ending2/ending3/ending4