We owned a 2000 Holiday Rambler Endeavor built on a Freightliner Chassis. This was probably one of the last units on the Freightliner as Monaco switched to their own chassis sometime in 2000.
Over 11 years and 60000 miles, it was a good solid unit. It had the cat 3126 engine and 6 speed allison transmission. Some of the Endeavors came with a smaller cummins with a little less power. The cat 3126 towed our Honda Odyssey with ease.
I don't know which years saw changes, but I drove a 1999 model and it was virtually identical to our 2000 model. Some of the older models had instrument panels that would not allow repair or replacement of one indicator. The whole panel would have to be replaced, or an alternate method of getting that info would have to be installed (ie new temp or oil pressure guage installed outside the instrument cluster).
My motorhome came with marginal tires for the load being carried. The original owner kept having blowouts on the left front tire. When I weighed the coach, I found the left front was running overloaded due to the slide weight being on the driver side. An upgrade in tire size cured that problem.
The Freightliner chassis is well supported, and Freightliner maintains a free help desk with well trained people to help you with problems encountered with the chassis. I never had a problem getting parts from them either (the location in Gaffney, SC).
If I can help with other questions, just ask. I still have the detailed maintenance log if you want to see what I encountered.
Good luck with your search.
Fred
Fred & Vicki
St. Augustine, Florida