My husband and I lived in a mobile home/RV park for 3 years. We recently bought a house about 2 hours up the road. The neighbor, who live in an RV next to us, wants to buy our RV and pay with personal check. 

We are so ready to get rid of that thing because lot rent, utilities, and homeowners insurance is eating us alive. Which is why I don't want to make him mad by implying his check might not be good and have him pull out of the deal. He's a nice and honest person. Not a stranger. He's been living there longer than us. 

Would I be the asshole if I tell him he has to pay with a cashier's check?