Nothing bigger than a 15,000 btu unit; but it should fit the exact spot just the same as the 13,500 unit. Not a lot bigger, but a new unit should be a bit more efficient. Wiring should be an exact swap, also. Randy
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/SIGPIC]'08 V-lite Flagstaff 30WRLS
'06 Ram 1500 QC hemi Reese dual cam sway control,
K&N series 77 intake, Hellwig helper spgs. LT tires,
Flowmaster "true duals", 380 h.p., Bilstein shocks
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