The 2015 I have has 14" tires and I purchased a double pack of BAL X Chocks that close down to 1 3/8" as the spacing was about 1 3/4". The specs on the Forest River website is showing 15" tires for 2016. Best to wait for the trailer so you can actually measure the distance. Bought mine on Amazon for just slightly more than a single one cost and got free shipping also. Unless someone has a 2016 and can measure the spacing wait and order later. Got mine within 5 days of placing order.
We also got some inexpensive screw type jackstands to put under the frame between the wheels and stairs as we found the stabilizers lacking compared to scissor jacks that we have had on all previous trailers.
These two combined to eliminate most of the shake and bounce we were feeling though not all of it.
I have a 2016 but it does not have 15 inch tires. I wish it did but no. Now it's is one of the first 2016's and they tend to change things mid year. For example the front cap came in for some of the later 2015s but not all of them.
We are about to pick up our new 2016 27rlws and are very excited. Our dealer states that due to the irregular surface of the front of the unit a diamond rock guard shield cannot be placed there. What do you guys use as an alternative if anything? Also what is a "PM", if it is a message ho w does one accomplish that task. We are newbie' to the forum.