Can I reenter Thailand after a 5-day trip to Cambodia with a previous 30-day visa?

The original poster, an American who has been in Thailand for 20 days, inquires if they can return after a 5-day trip to Cambodia. Responses from the community suggest that reentry is generally possible but not guaranteed. Recommendations include having proof of accommodation, onward travel, and sufficient funds available in cash (20,000 THB or equivalent). It was also suggested that applying for an extension of stay at an immigration office might be a more straightforward option to avoid uncertainty on reentry. Several members also debated the efficacy of using agents for immigration processes.