2018 Subaru outback towing a 1972 Shasta

I think the tongue weight is too much. If you can rebalance the trailer you might be OK. Trailer brakes will make it a lot safer to tow so have someone that knows trailers take a look at it.

I agree. The OB's rear springs and struts are WAY too soft for a tongue weight above 100lbs. I automatically replace the wimpy 16mm rear anti-swaybar on all my OBs with Subaru's much beefier 20mm Sti version to improve handling and reduce body roll, but even that won't reduce much the effects of a symmetrical "sag" from the equivalent of two people sitting on the bumper! I'm not currently aware of good aftermarket stiffer springsets and mating struts that would be cost-effective, but make sure that you treat all 4 corners as a system, and not just stiffen the rear, or you may engineer a lot of unintended oversteer when NOT towing your behemoth. Is there any way to rebalance the camper to reduce tongue weight in half or more? And do you really mean 72' long?

1972 perhaps?

Ah....