61 psi is about right, given the tire load rating and the weight of the unit.
That being said, there are advocates for pressures from there to the maximum indicated on the tire side wall. This question usually provokes an ongoing discussion of various preferences.
Personally, I run a bit higher than 61 as a little insurance against the slight loss of pressure that occurs over time - maybe 65 to 70. Higher pressures give better fuel mileage and perhaps a bit more peace of mind, but the ride will be harsher and tire wear will be less even across the tread.
Here's a thread from last year:
http://www.forestriverforums.com/for...is-109936.html
Dave