I just had an Equalizer installed by my dealer in January and it's made a huge difference. As for which one you need--you first have to determine what the tongue weight of your trailer is and then get the one that's above it. For my Salem 292, the tongue weight is 1125#, so the 1200# would be the right model (ie, it can take 1200# of weight, even though you don't need it to take the entire tongue weight--the 1000# would likely even be sufficient.) From what I can see from my dealer's install, there was no other special bracket other than the two that bolt to the trailer's frame. The head that goes into your 2" receiver is very specific and also built by Equalizer, but that was part of the package. Your 30' trailer is likely in the same ballpark with regard to tongue weight, depending on where your tank(s) are. You can find data online as well for all your trailer's specifications. I really dig the EQ and I'm glad I went with it. Good luck!
2015 XLR Hyperlite 30HFS5 (mods being performed regularly)
2009 Salem LA 292fkds (gone)
Nights- ('12)23 ('13)23 ('14)15 ('15)31 ('16)25
2014 Harley Davidson FLHX (XLR cargo)
2014 VW Jetta TDI (diesel sipper, camping support vehicle)
2011 Ram 2500 CC 4X4 CTD, B&W Companion (toy hauler hauler)