Hello Ron. I completely agree - the trucks on the Friendship cars are complete junk. I’ve swapped out the couplers with the replacements provided by Lionel service and the cars still pull themselves off the track - even on large curves. They should’ve been listed in the catalog as O72 min curve!
My fix is the use of donor cars. I find older scale cars with the awesome original version of the scale sprung trucks and swap them out. Train shows are the best source since shipping has become so expensive.
I bought 200+ pieces of Lionel scale rolling stock from ~2012 through the release of the Friendship cars (mostly new or NOS). Since then, I have bought nearly zero - I budget replacement trucks into the purchase equation and very few things have met the threshold. The cheapening of the scale trucks for cost reasons (I never believed the Kadee coupler story - it makes no logical business sense) eliminated my interest in the product.