It is a Ford thing !
We have owned Ford's for a long time and they are all slow on uphill climbs whether small or large.. that is my opinion of coure
Bought a new full size van in '84, and it would 'bog' down going over the ship channel bridge in Houston.. We just got used to it and remembered to get in the slow lane when a 'good climb' came up.. it is the same with the MH now.. otherwise,, on flatland,, it is a cruiser..
As to getting work done on your MH , I would suggest going to a local shop that someone (more than one if not a good friend) would recommend
I agree that was a quick diagnosis you got on the tranny... must have thought they seen words written on your forehead
take care, good luck!
& Slowpoke, USMC [1993 Gulfstream Sunvoyager M8345, F53 Chassis ]
"Travlin with a song and prayer"