I was at RV Village in Mercer, PA tonight, visiting friends, and would like to take an opportunity to write a review of the park.
RV Village Campground (main website)
RV Villages Site Map
RV Villages Rates
Our friends were on site 105 (w/e). Their site was grassy, and dry ground with good run off. The 1-107 loops are W/E only, most of these sites are at least partially shaded, and provide ample room to accommodate large rigs. I think that these loops are an excellent area for a group camp out weekend. Whatsmore is that there are no permanent campers in these loops.
If you need full hook ups though, the pull-thru sites are evenly numbered 172 through 192. These sites are partially shaded, but seem to be really close together. Today was a dry day and these sites show the effects of soil erosion. One year ago, I visited friends camping in these sites and recall that the ground was terribly muddy.
The rest of the 109-260 loops appear to be permanent campers, complete with golf carts (tonight was the Golf Cart Poker Run)

There may be an occasional transient site available within.
RV Villages rates seem simple enough. $22.00/night for Motorhomes and Trailers. $18.00/night for Pop Up campers. There is no extra charge for children. Moreover, there is no charge for visitors (unless staying overnight).
The camp store only has essentials. But grocery store and RV dealer are only a few miles away. Late this afternoon the pool was full of people. The evening's activity was BINGO. After dark, was the Golf Cart Poker Run.
My overall, personal impression is that RV Village is family friendly and family affordable. I would be very happy to camp in their 1-107 loop, and recommend these to my friends and anyone else looking to stay in Mercer, PA.
George Miklas