Yes and maybe no. You might be able to use a mobile tower, especially as your permit is nearing expiration. Mobile towers can be a viable option for temporary broadcasting needs, and they can provide flexibility in situations like this. However, it's essential to ensure that you comply with all relevant regulations and guidelines during the temporary tower's usage, even if your permit is close to expiration. Always check with the appropriate regulatory authorities or consult legal counsel to confirm compliance with local and federal broadcasting regulations.
Historically, the FCC has classified antennas affixed to trailers as temporary constructions. To obtain a facility license, a tower must meet the criterion of "durable construction," which means it should be affixed to a stable, immovable surface and connected to a permanent power source. Consequently, it's not possible to license a tower mounted on a trailer.
The sole scenario in which a trailer-mounted tower is acceptable occurs when an already licensed station temporarily relocates to a different site and only if the FCC has issued Special Temporary Authority permitting the use of these temporary facilities.
References:
Broadcast Towers, Inc., Order, 26 FCC Rcd. 7681, 7686 (MB 2011)
Manitee Media Corporation, Letter, 33 FCC Rcd. 6685, 6690 (MB 2018)