my parents just purchased a 33 ft class a motorhome. i wanted to use it like 2 times a year to go to the track prbly 45min drive. it has a 6way trailer harness. i would be pulling a open trailer with 3,000 lb car. but it has a 7 way. is this the adapter i need? http://www.bigdiscountrv.com/_product_57032/7-Way_to_6-Way_Adapter also do i need to install a brake controller on it? my neibor says i will have to reinforce the rear frame.