A couple of points from someone who actually owns a PleasureWay Excel (2007).
The propane tank is small but for cooking, heating water for dishes and showers we can easily go over one week. If you use the furnace that's a completely different story. You can go a few days but the killer is the battery. Using the furnace all night will drain the battery. Chances are you will not make it to the morning. We use warm sleeping bags and turn down the furnace and only use it in the morning to warm up the van. The other issue with boon-docking is water management, particularly finding a place to drain the holding tanks after a few days. We can get 3 to 4 days, depending on access to other facilities like toilets.
This is based on using only the built-in tanks and no dumping on the ground.
In conclusion, this van is designed more for traveling than fixed camping or boon-docking like a trailer for example. I hope this helps.
2007 PW Excel TS
2 adults