I WORKED FOR Western RV for for about 6yrs they had a DL and a SL package sorry I don't know what was included in each . If I remember correctly the wheels went from white to chrome roof rack n ladder added fridge from 2 way to 3 way not what went with each but those are some things . WRV went out after they started building motor coaches
Another Alpenlite owner here. Can't say that I have seen DL tagged on a model number anywhere. Western RV went belly up April 2008. That is no reason not to buy one. Everything in all RVs is third party supplied.
Boat: 32' 1996 Albin 32+2, single Cummins 315hp 40+ night per year overnighter