There’s a good chance that you’ll encounter some special insurance needs on your summer trip. For the most part, travel insurance is pretty cut and dried, but you need to take care with two types of insurance. Rental Car Collision. If you rent a car during your trip, you’ll encounter what has been a major headache for decades: how best to insure against the risk of paying for damage to a car you rent. You have four options: • A rental company will be happy to sell you a collision damage/loss waiver — CDW/LW for short. If your rented car gets banged up, you just turn it in and walk away. That sounds ideal, except for one flaw: The price, at up to $30 a day, can close to double the total cost of the rental. It’s obviously hugely profitable for the rental company, so the rental rep will push …