Can the MV be used with / attached to a jack?
Yes, your MV unit can attach to a side mounted jack jack.
The XL unit is often not compatible with center (coupler mounted) jacks as the coupler does not leave much space to maneuver the dolly.
Please note that this does lower the effective weight capacity of the unit to 8,500 lbs. Excessive side loading of trailer weight should also be avoided.