Well, the loan is consumer purpose, but the system is exempting it from Reg.Z under the "credit extension to other than a natural person" business exemption- 1026.3(a)(2).
I would be careful though if the trust is revocable as the line between natural and other than nautral becomes very blurred.
Although this loan doesn't sound like a real estate transaction, don't forget RESPA does not include this other than natural person exemption. So you can have a RESPA applicable loan while being exempt from Reg.Z