The folks at Winnebago can usually provide most any technical info you need, even for their older rigs. Suggest you contact owner relations at [email protected]
There are some stickies at the top of this forum with links to various techincal data and even brochures for the older Winnebago's. Not sure you will find all you need there but it may be worth a look.
'07 Country Coach Allure 470 Siskiyou Summit #31578, Cummins ISL 425; 2014 Ford F150 toad; Air Force One Toad Brake.
Glen Allen, VA; Smith Mountain Lake, VA.