A fifth wheel does not park like a travel trailer, and a Class A motorhome does not park like anything else on the lot. Both need more than a longer version of a standard space. The pin box on a fifth wheel changes where the length actually sits relative to the tow vehicle, and a Class A's own bumper to bumper length, mirrors included, is usually longer than the number on the dealer sticker. Spaces sized for an average trailer run out of room fast once something this size shows up.

At a Glance

  • Backyard Storage offers open air parking up through a 12x60 stall, sized for fifth wheels, Class A motorhomes, and other large rigs.
  • Manufacturer length specs are routinely shorter than the vehicle's actual parked length once mirrors, ladders, and rear mounted equipment are counted.
  • A fifth wheel's pin box placement changes how much of the rig's length sits behind the tow vehicle compared to a standard bumper pull trailer.
  • Covered parking with electricity is available at 12.5x40 and 12.5x45 for a large rig that benefits from a battery maintainer or shore power between trips.
  • Backyard Storage sits on FM78 East in Marion, TX, close to Canyon Lake and the rest of the lake corridor where large rigs are common.

Why Large Rigs Need Their Own Sizing Approach

A 12x20 or 12x24 space works fine for a mid size travel trailer or a single axle boat and trailer. A fifth wheel or a Class A motorhome is a different category entirely, not just a longer version of the same thing. The margin for error that barely matters on a 20 foot trailer becomes a real problem on a rig pushing 40 feet, since a few feet of miscalculation is the difference between a space that works and one where the rig physically will not clear the gate or the space next to it.

The Manufacturer Spec Is Not the Number to Trust

Dealer listings and manufacturer spec sheets tend to measure a rig's body length and leave out what actually sticks out past it. Mirrors, ladders, rear mounted air conditioners, bike racks, and awnings all add real length or width that does not show up on the sticker. The number that matters for parking is the vehicle as it actually sits, bumper to bumper and mirror to mirror, not the number printed in the brochure.

What Makes a Fifth Wheel Different From a Standard Trailer

The Pin Box Changes the Math

A bumper pull trailer hitches behind the tow vehicle in a fairly predictable way, with most of the trailer's length extending straight back from the hitch. A fifth wheel hitches over the truck bed itself, which means a portion of the trailer's overall length sits above and forward of the truck's rear axle rather than entirely behind it. This changes how the combined rig turns and backs, and it means a fifth wheel of a given length needs a different approach to backing and positioning than a bumper pull trailer of the same length would.

Height Matters More Than It Does for Other Rigs

A fifth wheel's raised front section, the part that sits over the truck bed, adds height that a standard travel trailer does not have. This rarely affects an open air parking space directly, but it is worth accounting for if a rig will ever sit under any kind of overhead structure or covered space, since the clearance that works for a standard RV roofline is not automatically enough for a fifth wheel's raised nose.

Sizing a Class A Motorhome or Large Fifth Wheel

Real world sizing guidance from facilities that manage this regularly generally treats a large Class A motorhome or a big fifth wheel, in the 38 to 45 foot range, as needing roughly 45 to 50 feet of space depth once mirrors and rear overhangs are counted, and a mid range fifth wheel or large Class C in the 32 to 38 foot range as needing something closer to 40 to 45 feet. Those figures are a starting point from general industry sizing practice, not a promise about any specific space, and actual available depth should always be confirmed against your rig's real measurement rather than assumed from a category label.

Measure the Whole Rig, Not Just the Trailer

For a fifth wheel or a motorhome towing a second vehicle, the number that matters is the combined length of everything that will sit in the space at once, not just the RV by itself. A fifth wheel parked with a truck still hitched underneath it needs the space to account for the truck's length too, unless the truck will be unhitched and moved elsewhere between visits.

Open Air Versus Covered for a Large Rig

Backyard Storage's open air parking runs up through a 12x60 stall, which covers the longest fifth wheels and Class A motorhomes common in this part of Guadalupe County. For a large rig that sits for extended stretches between trips, sun exposure and battery drain are real ongoing costs, not a minor detail. Our covered parking with electricity spaces at 12.5x40 and 12.5x45 let an owner run a battery maintainer or block heater between uses, though the shorter depth compared to the longest open air stalls means it is worth confirming your specific rig's length against both options before deciding. If your rig needs a dedicated storage unit for gear and supplies in addition to a parking space, our guide on choosing the right unit size covers how to size that separately.

Getting the Right Space at Backyard Storage in Marion

We work through fifth wheel and large motorhome sizing with owners regularly, since a rig this size does not leave room for guessing wrong. If you are not sure whether your rig fits one of our longer open air stalls or needs the covered option instead, stop by or call and we will walk the lot with you and compare it against your rig's actual measurements before you commit to a space. We are close enough to Canyon Lake, Lake McQueeney, and Lake Dunlap that large rigs headed to and from the water are a normal part of what we store.