Thanks for everyone who took time to reply.
You can always put a little more height on the camper by putting plywood or platform under the camper.
That sounds like a good way to get a tad more space.
While my Taco is a '05 Dbl cab the arch of the roof would be the same as the Access cab. 3.5" is what I have at the "crown" to the underside of the overhead, hope this helps.
Hmm, 3.5" sounds kind of tight as the Rotopax are 3", then adding the carrier material plus a quarter inch leeway to allow the pack to slide in and out.
I just measured - 3-1/2 inches from rounded roof rear of Tacoma above the cab brake light approximately 8-1/2 inches forward of the camper where the front wall of the camper meets the bottom of the bed.
Be advised there is decorative "bulge" in my 2013 roof about 10" forward of the forward wall of the camper. So the distance between the bottom of the camper bed and roof decreases about a quarter to half an inch.
And another measurement of 3.5" this time with an Eagle and your truck sounds like the same model as mine, though I'm not sure exactly what you mean by "decorative bulge"? The roof of my cab has four "ribs" (for the lack of a better term) running longitudinally, I assume for stiffening. Is that what you mean?
I spent some time in the garage this morning with a carpenter's level, a yard stick and a tape measure...
I measured 42.5" from bottom of camper to underside of camper overhang.
I balanced the level at what looked like the high point of the truck cab (on top of one of those "ribs") and taped the yard stick to align to its bottom edge & pointed at the truck bed, and verified it was level - my thinking this gives me the height of the roof.
I measured from the top of the FWC mounting bracket, on which the camper sits, to the bottom of the yard stick and came up with 38".
Now, unless I've made an error in my measurements or my thinking is wrong, then that would give me 6.5" of space between the cab roof and bottom of the camper overhang. This does not match the measurements of Jim or Captm.
According to the specs, there shouldn't be a difference in height between the Access Cab and Captm's Dbl Cab.
Jim's "bolted-on" mounting would cause his camper to sit about an inch lower than mine on top of those FWC brackets, but that still leaves a couple inches of discrepancy, sigh.
I'll do my measurements again tomorrow. Anyone see any fallacy in my measurement methodology?
[UPDATE: I found a high-res photo of my truck and camper taken from directly in front and level. By measuring a feature on the nose of the camper and counting pixels in the photo via Photoshop, I calculated the space between the two as 4" - much closer to Jim and Captm's measurements. I still plan to remeasure the truck and camper.]
Edited by Bosque Bill, 09 March 2014 - 02:54 PM.