I just replaced my Olivia 26" in our 2009 3670 Bighorn with a 2011 40" Samsung. The steel bracket in the Bighorn is custom made to fit the back of the Olivia. It will not likely fit any other tv. The solution for us was to purchase from Mennards a $60 ajustable LCD TV bracket, drill two additional mounting bolt holes in the Bighorn bracket and mount the swing arm bracket to it. The Samsung 40" easily slips onto the new bracket, it infinitely adjustable and fits exactly the the space available. The tv is easily removed from the bracket for travel.
Additionally, I purchased a second swing-arm LCD TV bracket and mounted it to a 20" section of 2" galvanized pipe, threaded the pipe onto a stock 2" floor flange and mounted it to the floor of the "basement" storage compartment. The 26" Olivia was then slipped onto the LCD mount. It is infinitely ajustable and can be swung completely inside the storage compartment against the rear wall providing unrestricted access to the compartment. The TV is also easily slipped off the mount for travel. Total cost for both mounts, pipe, etc. was approximately $110.