I did a little research since we own a Zinger and I have been following their changes to Rezerve, etc. I know that Rezerve was under Zinger in the beginning but was spun off as a separate model. Now it looks like all the 5ers went from Zinger to Rezerve. In any event, I found that ZF28RL appears to have started it's life as a Zinger but looks like it switched to Rezerve RFZ28RL. Here are side by side model pics which look identical to me.
I really like this model along with the RFZ32RE but not sure if we want any additional footage to haul.
Hope this helps.
Larry & Jean - Chesterfield, VA
2014 Ram 3500 4x4 dually crew cab - Black
2010 Montana 3665RE - New to us
2013 Zinger 30KB - Sold
CrossroadsRV Rally 2013 & 2014 - Northeast Crossroads Rally 2014 - Mason-Dixon Rally 2014