Assuming your
Trillium 4500 has a torsion trailer
axle (original equipment), that
axle will accept electric
brakes as long as it already has a brake mounting flange (square with four bolt holes) on each side. Here is a link to an in depth discussion on etrailer dot com as to what is needed:
https://www.etrailer.com/faq-Adding-...um-Brakes.aspx
I don't believe brake mounting flanges can be welded/added to a torsion
axle, i.e., I believe the brake mounting flanges must have been included in the original construction of the axle.
As long as the brake mounting flanges are on the axle, adding
brakes and wiring is a DIY project if you are mechanically inclined, or it can be done by a utility trailer shop.