Big, bulky, short-necked sauropods
Some sauropods (Barapasaurus, possibly Paralititan) have a big, chunky body, a very high weight, and a relatively short neck and tail.
At 60 ft long and 48 tonnes-odd in weight, Barapasaurus should be 20 ft Bite Reach, 20 ft Tail Slap Reach, 20 ft Space...