That's what they are literally called, look:

TIME.com: Light Trucks And Dirty Air -- Dec. 31, 1999 -- Page 1
Sport-utility vehicles have always been odd automotive beasts. Part miniature truck, part muscled-up car, they have all the amenities of a family sedan and ...
www.time.com/time/magazine/article/0,9171,992998,00.html


Travel in Peru
We sustained a sleepless night of truck engines roaring for we were next to the road that the huge automotive beasts could not easily climb or maneuver. ...
www.adventure-life.com/articles/peru-adventures-32.php


The Auto Channel--Indy Traditions
... when the US was clearly behind in the technological quest for individual travel, you see automotive beasts which clearly lagged behind European design, ...
www.theautochannel.com/sports/openwheel/ms9621.html

Benjamin Knight
... my driver's license photo was only appropriate for this page since I plan to one day be the rightful owner and drive of these fine automotive beasts. ...
www.louisville.edu/~bfknig01/


World's an oyster for Melbourne '06 - smh.com.au
... for a Monster Truck and Funny Car competition with points awarded out of 10 for the best automotive beasts the Commonwealth can knock together. ...
www.smh.com.au/articles/2002/08/02/1028157845240.html

North American cars like the corvette are usually referred to as muscle cars whereas trucks are usually referred to as monster trucks.