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First, most seasoned sand drivers will warn you – getting stuck is an inevitability. Hence, if you think you want to pull your trailer with you onto the beach, be prepared to get it stuck. Getting an SUV or a truck unstuck is one thing, but getting a travel trailer or fifth wheel out of beach sand, well, that's likely to wind up with the need of professional (spell that "expensive") help. Hence, the safest rule for RVers and sand is this one: Don't go where you couldn't use a pogo stick.
What about taking your sightseeing rig to the beach? The SAFEST bet to staying out of trouble is, sure, if it's a four-wheel-drive capable rig. Second best rigs for beach driving – rear-wheel drive. For some reason, front-wheel drive rigs are almost a sure bet for getting stuck. Full time 4x4 rigs beware -- you may be too low to the ground and your "low" gear not low enough for crawling out of a sticky situation.
When you do "hit the beach," STAY OFF dry sand. Dry sand is analogous to quicksand, and a sure bet for getting trapped. But even before you venture onto wet sand, which by its water-filled nature is a more firm and less likely cause of a hang-up, REDUCE your tire air pressure. By letting a few pounds out of your tires, you'll tend to roll the sidewalls of the tire out, giving a wider surface to "float" over the sand. BEWARE: Before you hit firm ground again you MUST reinflate those tires, so you'll need an efficient air pump you can use right there on the beach. Don't try to drive on solid ground with reduced pressure – you can "drive right out of the tires." How much pressure to let out of the tires? Popular Mechanics magazine recommends you reduce pressure in the typical SUV tire to 12 to 15 PSI – pretty low, but you'll need that extra width.
When on the sand, technique is important. Keep the pressure on the accelerator smooth and steady. If you start to bog, this is not the time to get off the gas, nor to jazz it, but rather, try keeping the pressure steady with a slow increase in speed. Don't try to make sharp turns – it's a surefire way of digging into the sand. If you get stuck, first try backing out gently. Still stuck? Take the floor mats out of the car and put them under the drive wheels for added traction. Rocking may help: Put the car in first gear, accelerate GENTLY to foll forward, stop before you hit the slip point, then let it roll back. The trick is to flatten the sand under your tires to give you a surface you can crawl out of. Try doing it a few times – but don't overdo it lest you risk damaging a transmission.