Access Cab Car Seats

I know this has been discussed before but in all my reading through all I can find are people saying to get the double cab. For me I really can't have a double cab long bed due to parking restrictions and the long bed is necessary for the work I need the truck for so the AC is really the right truck for me. My son is 17 months old and we have a Britax Boulevard Click Tight that fits okay in the front seat of the truck and fits in the back but with the seat all the way forward making the front seat completely useless. What we do now (which more or less works) is just put him up front with my wife in the back seat behind me but it would be really nice if we could find a car seat that fits behind the front seat with someone able to fit in the front. My wife is smallish so we don't need a lot of leg room. Does anyone have a carseat that fits in the back seat of an access cab reasonably?