A 3 to 5 year old Phoenix Cruiser will closely hold it's value for your intended purposes. I am not sure a 1 to 2 year old will as much because you would be paying so much more to buy it, and the worst of depreciation has not passed yet.
Regarding which model holds it's value the best, I think it is model 2551 and 2552. The twin beds in the shorter lengths seem to be most sought after, hence more apt to get your money back after a year or two of serious use.
As others have mentioned, "Condition" means so VERY much.
We special ordered our PC
HERE new in May 2007, paying $67,205, immediately followed by various suspension upgrades and other smaller rig-specifics including two built-in TVs, a 3rd captain seat, leather dinette, and other OEM upgrades done later to bring our investment to around $73,000. Because of how we store and care for our rig retaining it's "Like New" condition, along with it's low ~40,000 miles driven, I think I might be able to get half of that back in resale. I wouldn't really know for certain unless I tried, but selling our like-new PC would be a very dumb idea for us personally.