Tom Smith of the National Opinion Research Center writes:

The General Social Survey plans to include some items or short topical modules designed by users in its 2018 survey, and invites users to submit proposals recommending such items or modules. Proposals submitted in response to this call will be included based on assessments of their scientific merit; they need not be accompanied by funding to cover costs of data collection and data processing. The proposals are due by June 30, 2016.

See here for details.

Go for it! I used to be on the GSS external advisory board, and we loved reading these proposals.