i just purchased a RG26 (really 30) toy hauler and have been looking at the same issue.. My underbelly is enclosed with some vinyl material so i cant quite see where an after market Lippert tire carrier might fit.. The F150 has a roll top cover not a cap and id like to avoid placing the spare in the truck bed, truly the trailers spare belongs ON THE TRAILER! Lippert offers a cable run crank down bolt on - and one with optional slide storage drawers, but I'm not sure there is clearance...without removing the underbelly seals..
I too considered a jeep style bolt on mount to the ramp door, but the issues i suspect i would encounter are:
- Ramp door integrity (may not hold it and the weight of the tire might effect the hinge and the spring load)
- Swing arm mount that might mount to the passenger side and swing over to the ramp door. This way the wooden frame stud closest to the ramp door on the passenger side bears most the weight. wood, that's the issue! will it? i suspect the wooden from is 2x3 or less?
- Create a steel Y mount that attaches to the frame at the battery box and folds back to the diamond plate , but I've installed two batteries and with the weight disti hitch there is little room for that.
- Bolt on tire carrier to the 90 Degree angled front wall above the diamond plate? are the studs behind the corrugated strong enough for that? as mentioned elsewhere in the Pioneer forum, that diamond plate isn't fastened very well and there is 1/4 play when you push on it... i suspect they may want that panel to float as heat expands it?
- I've seen an after market above the battery Generator tray, might be able to mount that and add the tire up there.. not very air flow efficient.. and would be odd looking..
Understanding the structural strength of the walls and the space in the underbelly would be helpful...
My wife told me to stop McGyvering and just put the spare tire (that i haven't even purchased yet) in the truck bed!
Any insights or ideas?