That’s it, bingo.
My 43 ft Winnebago (450ISL) weighs 43,500lbs loaded with fuel pulling my Jeep. ( MH =40,000 & Jeep Liberty =3,500 )
If I fill the water add another 800 lbs.
It climbs ok. Took it to the Black hills and the White Mountains of New Hampshire already. But the technoform laminate in my MH weighs much less than the wood in your MH
My CCC is 8,000 lbs. which I will never get close to.
BTW I would expect it to struggle a bit if I did a trip to Breckinridge or Steamboat. I think I’m just on the edge weight wise for serious mountain climbing. I don’t do too much here in the East. 2000 maybe 3000 feet in New Hampshire. That’s not much.
What’s the weigh of your MH with a full tank and your toad?
Here is mine