If you only ever RV with shore power, just live with the 6300. No point in replacing it with a 7300 that does not need a battery as filter. Just make sure you have a battery, which you need anyway for going down the road, to operate the break-away brakes system.
If you buy a 7300 it will cost as much as a better-optioned 3-stage converter. One of the replacements is an Ultra 111 , which is a WFCO, which many here have had no luck with getting it to do all three stages. Stay away.
Best bet is one of the "lower portion" replacements by PowerMax or PD. Or you could get an Iota deck mount. Parallax has a whole newer line of converters that have several good features, but they tend to cost more than most.
No sense paying for features you will not use.