I know how everyone hates a re-post, but I have read a lot of the NJ-Cali threads and most of them are for Summer driving. Here is a little info on my condition, and hopefully someone can help me!

My boyfriend and I are relocating to Folsom, CA form Jackson, NJ the end of this week. We are driving a 2004 Dodge Ram 2500 Diesel 4-dr and towing a 28-ft enclosed race trailer with my car and other moving stuff inside. He has it tuned to run about 20 miles/gallon and we want to go from central NJ directly to Huntington Beach, CA (to see a friend) taking a southern route to avoid storms and bad weather, and then drive up through Cali to Folsom. I estimated this to take us about 5 days, driving about 13-15 hours/day (including pit stops for food and gas).
I looked on RandMcNally.com and I see that I-70 goes through Utah and the weather report says snow. My main concern is to avoid the Rockies this time of year. I see I-40 goes that way and it looks like I could probably take I-15 right into Huntington Beach. Problem is that I can't seem to find a website where I can put in the roads I want to travel on so it can tell me how to get to them.
Thanks to everyone who took the time to read this novel I worte, lol.