Tren is not the go to drug to make you gain Mass, it's actually harder to gain weight on tren, that's typically why it's used in contest prep and not in the off season, that and other various reasons. There's a school of thought you can use tren at low doses to get some of the benefits without the side effects and that is true, but by using low doses you negate all of the tren effects. Using trend in low doses doesn't make sense cuz you could just use a compound that's better at putting on Mass in higher doses with less side effects.
When it comes to drugs that are good for putting on Mass, tren is lower on the totem pole. It does keep you leaner on a bulk, but it also requires you to eat more food in order to bulk.
If gaining overall mass is your goal, run your testosterone higher, use a secondary compound like eq or deca or both, and eat more food, consider human growth hormone at more than five units a day as well.
I'm not against anyone using tren. You just asked the specific question and it's not the right choice for your goal.
Im currently stuck around 205 and eating 4000 calories daily is hard lol,, but if I added tren, my weight would go down, don't get me wrong, my body composition would improve too. And my strength would go up a little bit, but I would need to start eating even more food.