Ok, so the colder part of the year is approaching here in the Seattle area. I'm going to do a propex heater install. The easiest appears to be a Rocky Mountain Westy locking storage box that goes behind the passenger seat. Currently I have a removable powered subwoofer there. The other option is underneath the rearmost cabinet above the engine compartment. Installing in an existing cabinet/seat is NOT an option. Here's my question to those who have installed the Rocky Mountain Locking storage box - do you ever find it to be a problem space-wise? My powered subwoofer is a fair bit smaller than the box and am wondering if the storage box will impact the floor plan. Opinions? Comments?
Oh, I purchased a eberspacher gas heater but decided the propane would be easier. 

Tom
84 Westy "Spiny Norman"