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:
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.