Can I use a bus ticket to Laos as proof of onward travel for a multiple entry tourist visa application for Thailand?

A user is inquiring whether they can use a plane ticket for entry into Thailand and a bus ticket for exit to Laos as proof of onward travel for their Multiple Entry Tourist Visa (METV) application. While comments suggest that such proof is generally acceptable, it's noted that the final decision lies with the consulate, which may request additional documentation.