Your 2-inch thick cabinet bottom and poorly routed PEX lines are classic examples of RV manufacturers prioritizing cost over space efficiency. These issues can be addressed through cabinet modification and PEX rerouting.
Soft spot near vent indicates water-damaged wood. Remove membrane, cut out damaged plywood, replace with marine-grade, reseal membrane. Fix the vent leak that caused it.
Slideout rubbing wall with smaller bottom gap suggests drooping - worn lower rollers or adjustment needed. Inspect rollers, check mounting bolts, and look for floor damage underneath.
Lift slideouts for floor repair using bottle jacks and blocks under the extended slide frame, or a come-along from inside. Never rely solely on hydraulics - always use mechanical blocking.
Removing grill improves F53 battery access significantly. Use floor jack with wood block to lift 45lb battery to tray height, or get a helper. Battery carrier strap helps. Consider battery slide tray for future ease.
Jayco builds cabinets in-house, but many independent shops in Elkhart-Middlebury specialize in RV woodwork. Search locally for RV cabinet shops, ask dealership service departments for referrals, or contact Jayco parts department for supplier info.
T-track bulb seals available from RV seal specialists. Measure dimensions from old seal and clean track before installing.
The quickest fix is placing 1/2 inch plywood on the worn frame under your new mattress - distributes weight and prevents sagging. For long-term, consider replacing with jackknife sofa or complete sleeper mechanism. Plywood solution costs under 0.
For 2005 Fourwinds Hurricane with structural windshield damage, repair likely costs ,000-15,000. If that exceeds 50-60% of repaired value, salvage or sell as-is is usually better financially. Get multiple quotes and compare to actual market value before deciding.
Thor Avanti renovation is very doable. Jackknife sofa can replace dinette, vinyl plank flooring is popular, and mattress can be replaced with standard size in most cases.
Add minivan seats to your RV by mounting securely to floor joists with grade 8 bolts. Include proper seatbelts at each position. Elevate seats with plywood platforms if needed for clearance.