They're not great harvesting dinos in my opinion because they can't carry too much, but at higher levels they become strong battle mounts. I took my lv185 trike into the swamps to tame a beelz. When I finished I killed 7 titanboas 2 sarcos and a ton of dilos with it. I also tamed 2 high lv Beelzs and a low lv kapro. I was very impressed with him and I recommend you get one if your looking for a little protection.
P.S. if your looking for a good traveling or harvesting mount at low to mid level get an Iguanadan.
I can not stress enough to my friends how useful the trike is. Early game it makes a great pack animal. Late game in groups of three or four it can be used as a decent battle mount. Taming a trike early on can be a great way to start a large base and keep you well fed with berries.
A triceratops is a very special dinosaur in this game. It is easy enough to tame at a low level, yet powerful enough to take on raptors that could kill you easily. It can collect enough berries that you would never go hungry again, and still have some berries leftover to help tame more trikes. They are very slow but it can make up for it if you increase the weight, attack, and stamina stats. It is an extremely good pack animal because it can carry a lot, but still defend itself, especially if it is in a large group. Overall, the triceratops is one of my favorite and most versatile dinosaurs.
If you use the charge attack in a forest, they will get a lot of thatch but will get encumbered so beware of predators. Also, the turning radius is increased when charging and you can’t get berries when charging. Maybe this is helpful for lower level players. Thanks for reading and make sure to try it out