I use the following 30-watt Renogy panel when my 5th wheel is in storage during our 5-month off season. Keeps our 4 6-volt batteries topped up.:
https://smile.amazon.com/Renogy-12-Volt-monocrystalline-Solar-Panel/dp/B07MZL3PSD/ref=sr_1_2?a=aps&crid=2ZOCD6UDMJSHI&keywords=renogy+30w&qid=1667764454&sprefix=renogy+30&sr=8-2&ufe=app_do%3Aamzn1.fos.18ed3cb5-28d5-4975-8bc7-93deae8f9840
And I use this charge controller with it:
https://smile.amazon.com/dp/B004Q820UK/ref=redir_mobile_desktop?_encoding=UTF8&aaxitk=87975b49f0613849f129e63777bfaf4e&content-id=amzn1.sym.53aae2ac-0129-49a5-9c09-6530a9e11786%3Aamzn1.sym.53aae2ac-0129-49a5-9c09-6530a9e11786&hsa_cr_id=5773970610501&pd_rd_plhdr=t&pd_rd_r=b4298c85-1ad1-4321-8b70-5b0c037dd929&pd_rd_w=q9tZZ&pd_rd_wg=snbqr&qid=1667764695&ref_=sbx_be_s_sparkle_mcd_asin_0_img&sr=1-1-a094db1c-5033-42c6-82a2-587d01f975e8
It should do the job for the extended periods you mentioned; however, you may need a larger panel to bring the batteries to full charge between outings. This will depend upon how low the charge goes during usage and how many days you have before the next usage.
Good luck
