I didn't want to go through the taking a chance ordering a hitch and making sure the 5er I was going to buy was new enough to have chiseled corners. I just bought the Pullrite Superglide 2900 18K hitch and never had to worry. With my 2010 Cardinal I bought, no worries whatsoever.
It cost a bit more, but I negotiated the dealer picking up half the cost of new hitch and install when I bought the new truck.
Les (RVM12), Bonnie, Morgan and 4 leggers Bella & Bruce
2010 Forest River Cardinal 3450RL 40' Full Body Paint- 2015 Ram 3500 Laramie 6.7 ltr Turbo Diesel, 68RFE Trans. 4x4 SRW SB Pullrite 2900 18K
FMCA-420438 Good Sam