We're considering a new FW and a couple of the options are upgrading the single AC to 15k with 2nd AC prep (I believe the prep is standard). There is also a 30 to 50 amp option. First question; if I...
Go with 50 amp then you can use either. My trailer is 50 amp but I also carry a 30 amp cord and adapters. When traveling and just stopping for one nighters, I use the 30 amp cord. If the rig is just being stored, I will use a 20A adapter and regular extension cord. Much easier than humping that 50 amp thing which I only use for longer stays.