if You stick with gas I would consider or at least take a test drive in a workhorse with the Allison trans, my last coach had that combo and it was great. Only complaint was I wish it had more powah...... which is a typical complain on gassers
it was a 08 Fleetwood Bounder 38P, even pulling my wrangler unlimited I made it up every mountain out west, just sometimes with hazards and being in the truck lane.
The newer chassis will behave quite a bit different vs what you have now. It also migh have a bit more power vs what you presently have on paper however it’s also a few feet taller and possibly heavier, thus similar performance from a acceleration standpoint.
I have been that person with the hazards on a few times, never really bothered me when that occurs. Heck my Jeep Wrangler has a similar problem of being way to slow.... kinda the nature of the beast.
If you drive over 10K miles a year the added cost of ownership to a DP starts to equal out. If you do not drive much and also if you like staying at the same spot for months at a time the advantage goes to the gas RV.
There is no reason and gas RV can’t make it well over 100k Miles