Do what you like but the battery is going to boil off a bit of water floating at 14.2 volts.
Six hours on a generator is fine at 14.2 volts.
IQ controller is low cost preferred solution in all conditions.
Started with my Grandfather with his hand built ham radio and such.
Then the library. Such as in 4th grade when most are looking at comic books I checked out a book and home built a motor from junk in the garage.
Then mostly through automotive repair training and electric repairs at family owned rental apartments.
Learned a lot here also ;)
As long as the wire will easily handle the full converter rating I would not fuse the main connection. Actually if the main wire is safe, short and in plain sight I would also skip the battery side fuse.
Some of you seem to be of the opinion that the WFCO is of poor quality. Could anyone please be more specific? Since the output in three modes is the same for the WFCO and PD,.....If you ever see 14.4 out of the WFCO please give a post because it will be a historic moment.
Otherwise WFCO is just a 13.6 fixed voltage converter. Even the 13.2 float seems unreliable.
2004? wow it only lasted 10 years.
If mostly plugged in I would get the 35 or 45 amp PowerMax. If charging from generator a lot then get 45 amp IOTA or 60+ amp Progressive Dynamics.
If you do get solar think 100 watts and a good controller as a minimum for the effort.
Even with solar I recommend a switch to cut power to the trailer.
Disconnected should be fine. Home on a small charger is probably best.