Why compile both trunks? Because it's there.

Actually, you are correct that only one should be trunk for testing purposes. If something were to go wrong or incorrectly, it'd be a lot easier to suspect the trunk and look for answers than to look at both of them. As for that guide, it should state that one needs to specifically tell Tortoise installer to put command line tools in for those who are using tpcup. Also, I had been tired and just plain didn't see the guide.

I want to thank you Cyrax and JuhaManninen for your replies.