That Trike is cool as $#it,, but those old Schwinn ''Girder'' front ends, are generally ''very'' flimsy,, & get out of shape real easy,,, in supporting more weight than a kid.
Reason I know,, is we had the mythical 68' ''Grape Krate'' with the Girder front,, & I was to heavy for it,, even back in the later 9O's,, when I weighed around 190.
In the old ''back in the day'' HD & British Bike Chopper world,, a Girder front, had 1 spring,, & a Springer,, had 2.
Lastly,,
Trailing forks on that,, look really bowed,, compaired to what the ones on our Krate were.
Wonder if they got bent, or some kind of non Schwinn aftermarket types ??
I