We have stayed twice at this one
Great Promotions and Money Saving Packages at Oasis Las Vegas RV Resort
It is quite convenient to the "Strip," you could walk it in a pinch, although they do run regular shuttle buses, probably your best bet - It was a few years ago we were there last, but I think the shuttle just cost you a tip to the driver.
Its a beautiful campground and the facilities are amazing - gated entrance in a decent area, individual washrooms, great pool, etc.
The last time we were at Vegas, we stopped at a different spot and saved a few $$ but it wasn't worth it, it was further from the strip, you had to drive and park (Although we have never had problems finding a free parking spot very close to the casinos).
Worst though, it was not in the greatest area of town and several of the permenant residents warned us against walking outside the RV park, or even leaving anything of any value unsecured on our campsite!
Have fun and don't gamble away your kids inheritance!