we had 4 (2 kids wife and ) and 2 dogs in our FJC and it was insane tight our gobi rack was filled to and for longer trips a rear hitch carrier but limited off road
now in a 4 runner and still cutting down on gear more and more
switched to helinox chairs HUGE space savings
part of the sleeping insulation could be good pads that are inflated and insulated not the self inflating type which are huge even when rolled the newer better pads are the size of a Nalgene bottle
love our microfiber towels even shower size pack insane small and work better than regular towels
changed up our cooking a lot the partner steel griddle is most our meals and two GSI anodized dutch oven saves HUGE amount of weight IMHO is easier to clean and way less maintenance and we can double use them as regular pots of course
double use on a lot of things still figuring out or fav plates
liking the sea to summit delta plates a lot as I can use them for say making french toast as the sides are deep enough so consolidating and use of both prep and eating plates/bowls
for us it is two things really size and weight
also it seems with so much weight we can throw in our vehicles and on(armor etc..) we get to the point of over loading them means more wear and tear earlier breakage and lower mileage etc...
also just unloading and setting up heavy gear can be a pain literally
I am not sure how much weight we have saved but I know its a lot and I am willing to guess we have cut our weight in half and at the same time cut our gear space(size) by about the same
this was a older thread but we also started using duffels for our gear mainly gear management as I hated all the loose junk all over etc..
http://www.expeditionportal.com/for...ow-we-pack-using-large-duffels?highlight=gear
our FJC we had a gobi rack and ladder
on roof two water one fuel laid flat in scepter never had a leak with bags on top
ladder held our propane bottle
you can strap one smaller bag on top of your spare
if its just two of you I would think you could easily do it in the FJC with rear seats down and have plenty of room with a bit of rethinking