Originally Posted by Mike_L
I only park on reasonably level ground and always use a chock between the wheels on both sides...
Just to be clear: chocking between
the wheels is only applicable to tandem axle
trailers. The OP has a single axle
Scamp. 13. For that the BAL is probably the best option. Here's a picture. You would use this on the low side and a pair of heavy rubber chocks on the high side.
In really bad conditions you can also dig in the wheel on the high side (where permitted in some backcountry locations). You'll still want the chocks. Be sure to fill the rut when you leave.
One additional tip when unhitching in windy and/or steep conditions: leave at least one safety chain attached until the trailer is leveled, chocked, and resting on stabilizers. Once it's completely set up, the risk of unwanted movement is slight, and you can then detach the safety chain(s).