Sub-30ft Class C on International chassis?

My wife and I have been toying around with getting an RV for a couple years. However, I’ve never really been able to find what we want. Specifically a shorter Class C with a powerful diesel. We live in Alaska and many of the trips we take can have roads that have long steep hills. We’d like to tow a trailer for our side by side, or motorcycles, or snow machines. I’ve rented a couple Class C RV’s with the V10 (one 25’ and one 32’), and they both really seemed to struggle when pulling a trailer. Does a 26’-29’ International chassis Class C exist? Or any other diesel larger than the small Mercedes chassis.