You will be fine. I use a thin peice of plywood to stand or kneel on when doing work on roof to distribute the weight evenly. Make sure your shoes don't have rocks in the soles that could damage your roof as you walk on it.
TT: 2015 Jayco Jayflight 26BH Elite
TV: 2014 Ram 1500 Sport, 5.7 HEMI 3.21, Firestone 1000# air suspension. WD hitch w/800# bars
SOLD: 2012 Jayco J-series 1007