in a similar situation here Home Buyers in DFW are seeing builders back away from signed contracts on new homes unless the buyer kicks in ten of thousands of additional dollars.
Having dealt with contracts for Decades… I suspect that unless there is an enforceable escalation clause within the executed contract … these will head to court
So if you have a signed by both parties contract for horse trailer that states a specific cost without an escalation clause then one might want to talk with an attorney
Gee, may even be a violation of the RICO Act if these escalations where found to have been organized between manufacturers (and then there is that pesky old Sherman Anti Trust Act against conspiracy)… all over a horse trailer