Welcome and congrats on both the van and the baby on the way. Sounds like you are already getting to know your van. Can’t help with the Ford stuff, but if you ask in the appropriate forum I’m sure someone would help.
Not cheap options for quality suspension improvement I don’t believe. Another option might be Weldtec Designs, but not your cheap option. They are in El Cajon and Jeremy the owner is very knowledgeable, but also super busy.