Beach sand tires

Have a Tomcar running on knobby all-terrain tires: Front: 25x8-12 and Rear: 26x12-12. Weight of the vehicle is 1500#. Has a 3-cylinder engine with CVT. I can only get 25-30MPH in a vehicle that easily tops 45MPH in the wild. I must be bogging down.
Need help (HELP!) figuring what tires are best for FLAT SoCal beaches, with fine, ungroomed sand. Assume they might occasionally run on pavement from place to place (1-2% of the time). I would replace the heavy, reinforced steel rims with aluminum.
These are beache, no dunes. V-paddle? Straight? Should I change the front tires too even though it's a 2WD?
I've been on the Net but the search for answers is frustrating. Any help would be appreciated.

[jlb1001]

You'll need a very mellow all terrain tire with that set up. If you do not have a lot of power, then any sort of knobby/mud tire will suck in the sand. I use BFG all terrains myself, on a Samurai, aired down to 9 psi.

Thanks for the suggestion and will keep it in mind. In the meantime, we added the Carlisle Turf Chief in back for an immediate increase in 10MPH. We are about to trade out the front knobbies for Carlisle All Trail (per ToyJunkies in Mesa, AZ). We may swap out the rugged but heavier reinforced wheels for mags to see if decreasing the rotational weight makes any difference.