I too am not a big fan of drilling holes in the tongue frame if I don't have to.
These square U-BOLT are perfect for mounting the diamond plated boxes to the tongue frames.
I have seen them mounted both ways with the nuts on the inside of the box or under the trailer frame cross bracket
My choice for the tool box is one of those truck side mount boxes like this one. The 48-inch box will hold 4 each GC2 6V Deep cycle batteries from COSTCO.
They look great on the trailer tongue mounted between the front TT wall and the propane tanks
The LIP area of the box is perfect for mounting round vents from LOWES for venting the batteries... The LIP area is also perfect for routing and securing your battery cables for a nice professional look and adding the BLUE SEA Battery switches..
My friend used sink drains (LOWES) for the battery vents which I thought was a great idea..
Photos from GILLDAWG79
food for thought
Roy Ken
My Posts are IMHO based on my experiences - Words in CAPS does not mean I am shouting
Roy - Carolyn
RETIRED DOAF/DON/DOD/CONTR RADIO TECH (42yrs)
K9PHT (Since 1957) 146.52M
2010 F150, 5.4,3:73 Gears,SCab
2008 Starcraft 14RT EU2000i GEN
2005 Flagstaff 8528RESS