Driving in the sand

Thanks for all the responses. I will let you know how we fair. All though the lake is mighty high I have found out so there might not be much sand:( We are heading to Lake Macconaughy, located by the Nebraska Colorado border in the sand hills. It has a hundred miles of shore line but the darn thing is almost full. We have been there many times. We and our group would drive down through the sand to stay by the shoreline. Many times getting stuck. We were in my old class C. I would just get pulled out. There are a lot of other people there. The only time I aired down before was when pulling my 5th wheel. It worked great but we weren't to far into the sand. With the TC I want to pull as close as possible to the water. So I will take some pics and let you all know how I fair. From the responses above it looks to me like the mid 20's is where I am going to start. Sounds like crazy jefe :) has the most experience so I will go with what he suggests.
Thanks again!