I contacted Thule directly and they informed me that this is a rack that is only stocked in Asia. They encourage you to contact Thule Asia or the Thule website for the Philippines. view full answer...
It sounds like your travel trailer has an RV-style 7-way blade plug, such as what is shown in the linked photo. This is a popular configuration for trailers with electric brakes and 12V power service.
You can install a mating 7-way socket on your 1991 Volvo 240 Series to provide lighting, a brake signal as well as 12V power using our brake controller installation kit # ETBC7. The kit includes a 7-way vehicle socket, wiring, circuit breakers and everything you need for installation of a... view full answer...