I seriously doubt anyone here can help.
First, your Forester is not a FR product since it was built years before FR was founded.
Second, your Forester is a trailer and today's Forester has always been a Motorhome.
Third, you posted in the Motorhome section of the Forum.
I agree about a vintage trailer forum.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package