It's not the engine you should worry about....it's the tranny that will fail.
On the drivers side, usually behind the driver's seat, on the wall, should be a stick on placard. This placard gives you all kinds of information.
On this placard will be:
GVWR, Gross Vehicle Weight Rating
GAWR/Frt, Gross Axle Weight Rating-Front
Gwar/Rear, Gross Axle Weight Rating-Rear
It may also contain the GCVWR, Gross COMBINED Vehicle Weight Rating.
It's the last one you're interested in. This is the weight of your fully loaded coach PLUS the weight of your fully loaded tow vehicle. Look closely at your hitch. Usually there is a sticker telling you the load capacity. Your vintage coach should either have a 3500# or 5000# hitch. It will not have a 10,000# hitch. Weigh your coach, weight the Jeep, get the numbers off your placard and then we can give you a better answer. With what you've provided, all anyone can do is guess.....Dennis
The 34RQ GVWR is 17,000# with the Ford engine.
Here's a link to your brochure:
Itasca Suncruiser 34RQ